buildx VS checkout

This is great! I’ve been waiting a long time for this and it seems like more debug features are in the pipeline too: https://github.com/docker/buildx/issues/1104

Docs: https://docs.docker.com/engine/reference/commandline/buildx_...

Container engine: Docker v23.0.4 | Buildx v0.10.4

ARCH=amd64 # change to 'arm64' for M1 VERSION=v0.10.4 curl -LO https://github.com/docker/buildx/releases/download/${VERSION}/buildx-${VERSION}.darwin-${ARCH} mkdir -p ~/.docker/cli-plugins mv buildx-${VERSION}.darwin-${ARCH} ~/.docker/cli-plugins/docker-buildx chmod +x ~/.docker/cli-plugins/docker-buildx docker buildx version # verify installation

wget -O /tmp/docker/cli-plugins/docker-buildx https://github.com/docker/buildx/releases/tag/v0.10.4/buildx-v0.10.4.linux-amd64

Your particular one looks somewhat like https://github.com/docker/buildx/issues/1595.

Now, we have examples of the actual definitions for a single application’s docker container. Notice that we set the contexts key here which references the dependency targets we just defined. You can basically think of this like the depends_on block if you’ve used Terraform before. The args key let’s us populate the ARG variables in the Dockerfile. This is what is ultimately different between each of the containers. In the future, the buildx team might support using for_each loops like in Terraform but for now each block will have a bit of duplication.

Now as bonus we i will add how to use this techniques to build a multi arch build container. Maybe you have the same application but you need to run it in arm or riscv architecture. For this we can use the buildx plugin from docker https://github.com/docker/buildx.

Third step is docker/setup-buildx-action configures buildx, which is a Docker CLI plugin that provides enhanced build capabilities.

checkout

To checkout the merged commit with actions/checkout on pull_request_target event, you need to get the pull request by GitHub API and set the merge commit hash to actions/checkout input ref.

If you re-run GHA after master changes, CI is testing over different code.

You can [disable](https://github.com/actions/checkout#checkout-pull-request-head-commit-instead-of-merge-commit) on the checkout action:

```

There was an outage yesterday too when the GitHub action “checkout@v3” broke when they released “checkout@v4”

Yes, they broke the ability for GitHub CI to checkout repos…

https://github.com/actions/checkout/issues/1448

The first two steps are setting up the job's environment. The checkout action will checkout out the repository at the triggering ref. The setup-python action will setup the desired Python runtime. My package supports Python 3.9+ so I'm targeting the minimum version for my build environments.

These first few steps demonstrate how you can run commands like npm install or import other workflows such as how it uses the actions/checkout to copy the contents of the repository into a working directory on the runner host. Read Reusable workflows for more about the syntax for referencing them.

Check out the repo: We will use the actions/checkout action to checkout the repository.

Take a look at the checkout action usage here https://github.com/actions/checkout

Then, we have two important initial steps to define. The first one is an official GitHub Action used to check-out a repository so a workflow can access it. The second one it's pretty more complex but, briefly, downloads and set up a requested version of Java.