GitHub Action to build and publish Docker Images to GitHub Package Registry

Usage examples:

Build and publish Docker Image with a head tag for the develop branch

  build-and-publish-head:
    runs-on: ubuntu-latest
    if: github.ref == 'refs/heads/develop' # Running this job only for develop branch

    steps:
    - uses: actions/checkout@v2 # Checking out the repo

    - name: Build and Publish head Docker image
      uses: VaultVulp/[email protected]
      with:
        github-token: ${{ secrets.GITHUB_TOKEN }} # Provide GITHUB_TOKEN to login into the GitHub Packages
        image-name: my-cool-service # Provide Docker image name
        image-tag: head # Provide Docker image tag

Build and publish Docker Image with a latest tag for the master branch with different dockerfile

  build-and-publish-latest:
    runs-on: ubuntu-latest
    if: github.ref == 'refs/heads/master' # Running this job only for master branch

    steps:
    - uses: actions/checkout@v2 # Checking out the repo

    - name: Build and Publish latest Docker image
      uses: VaultVulp/[email protected]
      with:
        github-token: ${{ secrets.GITHUB_TOKEN }} # Provide GITHUB_TOKEN to login into the GitHub Packages
        image-name: my-cool-service # Provide only Docker image name, tag will be automatically set to latest
        dockerfile: Dockerfile_server

Build and publish Docker Image with a tag equal to a git tag

  build-and-publish-tag:
    runs-on: ubuntu-latest
    if: startsWith(github.ref, 'refs/tags/') # Running this job only for tags

    steps:
    - uses: actions/checkout@v2

    - name: Build and Publish Tag Docker image
      uses: VaultVulp/[email protected]
      with:
        github-token: ${{ secrets.GITHUB_TOKEN }} # Provide GITHUB_TOKEN to login into the GitHub Packages
        image-name: my-cool-service # Provide only Docker image name
        extract-git-tag: true # Provide flag to extract Docker image tag from git reference

Build and publish Docker Image with a differnet build context

  build-and-publish-dev:
    runs-on: ubuntu-latest
    if: github.ref == 'refs/heads/develop' # Running this job only for develop branch

    steps:
    - uses: actions/checkout@v2 # Checking out the repo

    - name: Build and Publish head Docker image
      uses: VaultVulp/[email protected]
      with:
        github-token: ${{ secrets.GITHUB_TOKEN }} # Provide GITHUB_TOKEN to login into the GitHub Packages
        image-name: my-cool-service # Provide Docker image name
        build-context: ./dev # Provide path to the folder with the Dockerfile

Pulling the image before building it

  pull-and-build-dev:
    runs-on: ubuntu-latest
    if: github.ref == 'refs/heads/develop' # Running this job only for develop branch

    steps:
    - uses: actions/checkout@v2 # Checking out the repo

    - name: Build and Publish head Docker image
      uses: VaultVulp/[email protected]
      with:
        github-token: ${{ secrets.GITHUB_TOKEN }} # Provide GITHUB_TOKEN to login into the GitHub Packages
        image-name: my-cool-service # Provide Docker image name
        pull-image: true # Raise the flag to try to pull image

Passing additional arguments to the docker build command

  build-with-custom-args:
    runs-on: ubuntu-latest
    if: github.ref == 'refs/heads/develop' # Running this job only for develop branch

    steps:
    - uses: actions/checkout@v2 # Checking out the repo

    - name: Build with --build-arg(s)
      uses: VaultVulp/[email protected]
      with:
        github-token: ${{ secrets.GITHUB_TOKEN }} # Provide GITHUB_TOKEN to login into the GitHub Packages
        image-name: my-cool-service # Provide Docker image name
        custom-args: --build-arg some=value --build-arg some_other=value # Pass some additional arguments to the docker build command

---

You will encounter the following log message in your GitHub Actions Pipelines:

WARNING! Using --password via the CLI is insecure. Use --password-stdin.
WARNING! Your password will be stored unencrypted in /github/home/.docker/config.json.
Login Succeeded

I would like to encourage you, that I do not store your secrets, passwords, token, or any other information.

This warning informs you about the fact, that this Action passes your GitHub token via the command line argument:

docker login -u publisher -p ${DOCKER_TOKEN} docker.pkg.github.com

In a non-safe environment, this could raise a security issue, but this is not the case. We are passing a temporary authorization token, which will become useless once the pipeline is complete. It will also require additional code to extract this token from the environment or docker internals, that this Action does not have.