Publishing the imageīuilding the Docker image is great, but that image artifact disappeared when the job finished. The workflow should finish in under 15 seconds, and if we see that succeed in the Actions or Pull Request UI then we know the image built successfully. With this config, GitHub Actions will execute the workflow on every code push, so once these files are committed and pushed, Actions will run docker build and continue to on every subsequent push. github/workflows/main.yml: name: CI/CD # Run on pushes to any branch on: push jobs: build: name: Docker build # Use the Ubuntu virtual environment to run this job in runs-on: ubuntu-latest steps: # Checkout the repository files - name: Checkout uses: # Build the hello world image - name: Build Docker image run: docker build -tag helloworld. Then we'll create the beginnings of our Actions workflow at. This can be tested with a command such as: $ docker build -tag helloworld. ![]() Let's make a simple hello world Dockerfile: FROM alpine: 3.13. A Docker Hub account to push your image to. ![]() Setupįor this project you will need a couple things: GitHub Actions left beta about a year ago, and has been growing in popularity as a replacement for other CI/CD services in part to its tight integration with GitHub repositories.Īs of writing, the Actions free plan offers unlimited build minutes for public repositories, 2,000 build minutes per month for private repositories, and 20 concurrent jobs - much more than other freemium services. We'll touch on the second part here, the CI/CD workflow for Docker images. Now imagine you had a tool to update the application version for you automatically in your Dockerfile, and a CI/CD workflow that would take care of the building, tagging, testing, and publishing of the image - it could maintain itself indefinitely without your intervention. Imagine you maintain a public Docker image of an application that has frequent version changes - every time a new version is released you'll have to spend time building, tagging, testing, and publishing a new version. ![]() MotivationĪutomated builds, when combined with tests, are a great tool to increase iteration speed on projects through time savings. Publishing Docker images is a common CI/CD task, and the tight integration GitHub Actions has with GitHub repositories makes it a great tool for the job.
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