Create Dockerfile

[rfried-nrl]

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[github-learning-lab]

Nice work, you committed a Dockerfile. You'll notice at the end of the Dockerfile, we refer to an entrypoint script.

ENTRYPOINT ["/entrypoint.sh"]

The entrypoint.sh script will be run in Docker, and it will define what the action is really going to be doing.

Step 2: Add an entrypoint script

An entrypoint script must exist in our repository so that Docker has something to execute.

⌨️ Activity: Add an entrypoint script and commit it to your branch

1. As a part of this branch and pull request, create a file in the /action-a/ directory titled entrypoint.sh. You can do so with this quicklink

2. Add the following content to the entrypoint.sh file:

   #!/bin/sh -l
   
   sh -c "echo Hello world my name is $INPUT_MY_NAME"

3. Stage and commit the changes

4. Push the changes to GitHub

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I'll respond when I detect a new commit on this branch.

[github-learning-lab]

Nice work adding the entrypoint.sh script.

In entrypoint.sh, all we're doing is outputting a "Hello world" message using an environment variable called MY_NAME.

Next, we'll define a workflow that uses the GitHub Action.
Next, we'll define the action.yml file which contains the metadata for our action.

action.yml

All actions require a metadata file that uses YAML syntax. The data in the metadata file defines the inputs, outputs and main entrypoint for your action.

Step 3: Add an action metadata file

We will use an input parameter to read in the value of MY_NAME.

⌨️ Activity: Create action.yml

1. As a part of this branch and pull request, create a file titled action-a/action.yml. You can do so using this quicklink or manually.

2. Add the following content to the action.yml file:

   name: "Hello Actions"
   description: "Greet someone"
   author: "[email protected]"
   
   inputs:
     MY_NAME:
       description: "Who to greet"
       required: true
       default: "World"
   
   runs:
     using: "docker"
     image: "Dockerfile"
   
   branding:
     icon: "mic"
     color: "purple"

3. Stage and commit the changes

4. Push the changes to GitHub

---

I'll respond when I detect a new commit on this branch.

[github-learning-lab]

Next, we'll define a workflow that uses the GitHub Action.

Workflow Files

Workflows are defined in special files in the .github/workflows directory, named main.yml.

Workflows can execute based on your chosen event. For this lab, we'll be using the push event.

We'll break down each line of the workflow in the next step.

Step 4: Start your workflow file

First, we'll add the structure of the workflow.

⌨️ Activity: Name and trigger your workflow

1. Create a file titled .github/workflows/main.yml. You can do so using this quicklink or manually:
   • As a part of this branch and pull request, create a workflows directory nested inside the .github directory.
   • In the new .github/workflows/ directory, create a file titled main.yml
2. Add the following content to the main.yml file:

   name: A workflow for my Hello World file
   on: push

3. Stage and commit the changes
4. Push the changes to GitHub

Trouble pushing? Click here.

The main.yml file cannot be edited using an integration. Try editing the file using the web interface, or your command line.

It is possible that you are using an integration (like GitHub Desktop or any other tool that authenticates as you and pushes on your behalf) if you receive a message like the one below:

To https://github.com/your-username/your-repo.git
 ! [remote rejected] your-branch -> your-branch (refusing to allow an integration to update main.yml)
error: failed to push some refs to 'https://github.com/your-username/your-repo.git'

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I'll respond when I detect a new commit on this branch.