Copy from https://github.com/actions/hello-world-docker-action

.gitattributes

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+* text=auto eol=lf

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: docker
+    directory: /
+    schedule:
+      interval: weekly
+    groups:
+      docker-minor:
+        update-types:
+          - minor
+          - patch
+
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+    groups:
+      actions-minor:
+        update-types:
+          - minor
+          - patch

.github/linters/.checkov.yaml

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+quiet: true
+skip-check:
+  # Ensure that HEALTHCHECK instructions have been added to container images
+  - CKV_DOCKER_2
+  # Ensure that a user for the container has been created
+  - CKV_DOCKER_3

.github/linters/.markdown-lint.yml

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+# Unordered list style
+MD004:
+  style: dash
+
+# Ordered list item prefix
+MD029:
+  style: one

.github/linters/.yaml-lint.yml

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+rules:
+  document-end: disable
+  document-start:
+    level: warning
+    present: false
+  line-length:
+    level: warning
+    max: 80
+    allow-non-breakable-words: true
+    allow-non-breakable-inline-mappings: true

.github/workflows/ci.yml

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+name: Continuous Integration
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+
+jobs:
+  test-docker:
+    name: Docker Tests
+    runs-on: ubuntu-latest
+
+    # Run a local registry to push to
+    services:
+      registry:
+        image: registry:2
+        ports:
+          - 5001:5000
+
+    env:
+      TEST_TAG: localhost:5001/actions/hello-world-docer-action:latest
+
+    steps:
+      - name: Checkout
+        id: checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Docker BuildX
+        id: setup-buildx
+        uses: docker/setup-buildx-action@v3
+        with:
+          install: true
+          driver-opts: network=host
+
+      - name: Build the Container
+        id: build
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ${{ env.TEST_TAG }}
+
+      - name: Run the Container
+        id: run
+        env:
+          INPUT_WHO_TO_GREET: Mona Lisa Octocat
+        run: |
+          docker run \
+            --env INPUT_WHO_TO_GREET="${{ env.INPUT_WHO_TO_GREET }}" \
+            --rm ${{ env.TEST_TAG }}
+
+  test-action:
+    name: GitHub Actions Test
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        id: checkout
+        uses: actions/checkout@v4
+
+      - name: Test Local Action
+        id: test-action
+        uses: ./
+        with:
+          who-to-greet: Mona Lisa Octocat
+
+      - name: Print Output
+        id: output
+        run: echo "${{ steps.test-action.outputs.time }}"

.github/workflows/linter.yml

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+name: Lint Codebase
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+  packages: read
+  statuses: write
+
+jobs:
+  lint:
+    name: Lint Codebase
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        id: checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Lint Codebase
+        id: super-linter
+        uses: super-linter/super-linter/slim@v7
+        env:
+          DEFAULT_BRANCH: main
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          VALIDATE_ALL_CODEBASE: true

.gitignore

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+# Logs
+logs
+*.log
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# dotenv environment variables file
+.env
+.env.test
+
+# OS metadata
+.DS_Store
+Thumbs.db
+
+# IDE files
+.idea
+.vscode
+*.code-workspace

.prettierrc.json

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+{
+  "printWidth": 80,
+  "tabWidth": 2,
+  "useTabs": false,
+  "semi": false,
+  "singleQuote": true,
+  "quoteProps": "as-needed",
+  "jsxSingleQuote": false,
+  "trailingComma": "none",
+  "bracketSpacing": true,
+  "bracketSameLine": true,
+  "arrowParens": "avoid",
+  "proseWrap": "always",
+  "htmlWhitespaceSensitivity": "css",
+  "endOfLine": "lf"
+}

CODEOWNERS

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+# Repository CODEOWNERS
+
+* @actions/actions-oss-maintainers

Dockerfile

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+# Set the base image to use for subsequent instructions
+FROM alpine:3.21
+
+# Set the working directory inside the container
+WORKDIR /usr/src
+
+# Copy any source file(s) required for the action
+COPY entrypoint.sh .
+
+# Configure the container to be run as an executable
+ENTRYPOINT ["/usr/src/entrypoint.sh"]

LICENSE

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+MIT License
+
+Copyright GitHub
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Hello, World! Docker Action
+
+[![GitHub Super-Linter](https://github.com/actions/hello-world-docker-action/actions/workflows/linter.yml/badge.svg)](https://github.com/super-linter/super-linter)
+![CI](https://github.com/actions/hello-world-docker-action/actions/workflows/ci.yml/badge.svg)
+
+This action prints `Hello, World!` or `Hello, <who-to-greet>!` to the log. To
+learn how this action was built, see
+[Creating a Docker container action](https://docs.github.com/en/actions/creating-actions/creating-a-docker-container-action).
+
+## Create Your Own Action
+
+To create your own action, you can use this repository as a template! Just
+follow the below instructions:
+
+1. Click the **Use this template** button at the top of the repository
+1. Select **Create a new repository**
+1. Select an owner and name for your new repository
+1. Click **Create repository**
+1. Clone your new repository
+
+> [!CAUTION]
+>
+> Make sure to remove or update the [`CODEOWNERS`](./CODEOWNERS) file! For
+> details on how to use this file, see
+> [About code owners](https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners).
+
+## Usage
+
+Here's an example of how to use this action in a workflow file:
+
+```yaml
+name: Example Workflow
+
+on:
+  workflow_dispatch:
+    inputs:
+      who-to-greet:
+        description: Who to greet in the log
+        required: true
+        default: 'World'
+        type: string
+
+jobs:
+  say-hello:
+    name: Say Hello
+    runs-on: ubuntu-latest
+
+    steps:
+      # Change @main to a specific commit SHA or version tag, e.g.:
+      # actions/hello-world-docker-action@e76147da8e5c81eaf017dede5645551d4b94427b
+      # actions/hello-world-docker-action@v1.2.3
+      - name: Print to Log
+        id: print-to-log
+        uses: actions/hello-world-docker-action@main
+        with:
+          who-to-greet: ${{ inputs.who-to-greet }}
+```
+
+For example workflow runs, check out the
+[Actions tab](https://github.com/actions/hello-world-docker-action/actions)!
+:rocket:
+
+## Inputs
+
+| Input          | Default | Description                     |
+| -------------- | ------- | ------------------------------- |
+| `who-to-greet` | `World` | The name of the person to greet |
+
+## Outputs
+
+| Output | Description             |
+| ------ | ----------------------- |
+| `time` | The time we greeted you |
+
+## Test Locally
+
+After you've cloned the repository to your local machine or codespace, you'll
+need to perform some initial setup steps before you can test your action.
+
+> [!NOTE]
+>
+> You'll need to have a reasonably modern version of
+> [Docker](https://www.docker.com/get-started/) handy (e.g. docker engine
+> version 20 or later).
+
+1. :hammer_and_wrench: Build the container
+
+   Make sure to replace `actions/hello-world-docker-action` with an appropriate
+   label for your container.
+
+   ```bash
+   docker build -t actions/hello-world-docker-action .
+   ```
+
+1. :white_check_mark: Test the container
+
+   You can pass individual environment variables using the `--env` or `-e` flag.
+
+   ```bash
+   $ docker run --env INPUT_WHO_TO_GREET="Mona Lisa Octocat" actions/hello-world-docker-action
+   ::notice file=entrypoint.sh,line=7::Hello, Mona Lisa Octocat!
+   ```
+
+   Or you can pass a file with environment variables using `--env-file`.
+
+   ```bash
+   $ echo "INPUT_WHO_TO_GREET=\"Mona Lisa Octocat\"" > ./.env.test
+
+   $ docker run --env-file ./.env.test actions/hello-world-docker-action
+   ::notice file=entrypoint.sh,line=7::Hello, Mona Lisa Octocat!
+   ```

action.yml

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+name: Hello, World!
+description: Greet someone and record the time
+author: GitHub Actions
+
+# Define your inputs here.
+inputs:
+  who-to-greet:
+    description: Who to greet
+    required: true
+    default: World
+
+# Define your outputs here.
+outputs:
+  time:
+    description: The time we greeted you
+
+runs:
+  using: docker
+  image: Dockerfile
+  env:
+    INPUT_WHO_TO_GREET: ${{ inputs.who-to-greet }}

entrypoint.sh

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+#!/bin/sh -l
+
+# Use INPUT_<INPUT_NAME> to get the value of an input
+GREETING="Hello, $INPUT_WHO_TO_GREET!"
+
+# Use workflow commands to do things like set debug messages
+echo "::notice file=entrypoint.sh,line=7::$GREETING"
+
+# Write outputs to the $GITHUB_OUTPUT file
+echo "time=$(date)" >>"$GITHUB_OUTPUT"
+
+exit 0