Sharing CircleCI configuration / Dockerfile to build, test, and push Elixir Docker images

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I spent quite a bit of time trying to find a good configuration to build / test my Elixir app in CircleCI and then push an image to Docker Hub. It is probably a somewhat common thing, but I did a lot of research and trial and error moving around different steps until I got it to a good point. I wanted to share in case in ended up being useful to somebody else searching Google :grin:

Features:

  • Uses Circle CI caching for dependencies / compiled files
  • Runs tests + code checks (using ex_check)
  • Builds and pushes images to Docker Hub:
    • One tag with the Circle CI build number
    • One tag with the git sha
    • One tag with latest (if the current branch is main)
  • A Dockerfile is included which uses Docker’s multi-stage builds and Elixir releases so that the resulting images (for this simple app) ends up around 12.5 MB

I’ve made it available in a GitHub Gist:

Comments welcome here or there

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