Hello, World! Docker Action

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.

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
2. Select Create a new repository
3. Select an owner and name for your new repository
4. Click Create repository
5. Clone your new repository

Caution

Make sure to remove or update the CODEOWNERS file! For details on how to use this file, see About code owners.

Usage

Here's an example of how to use this action in a workflow file:

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/[email protected]
      - 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! :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 handy (e.g. docker engine version 20 or later).

1. 🛠️ Build the container

   Make sure to replace actions/hello-world-docker-action with an appropriate label for your container.

   docker build -t actions/hello-world-docker-action .

2. ✅ Test the container

   You can pass individual environment variables using the --env or -e flag.

   $ 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.

   $ 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!