Commits on May 4, 2023

1. Optimize container build time …

   - Use cache mounts for pip and apt, heavily reducing network requests
     when cache is warm.
   - Remove git as a build-time dependency, other than switching to archive
     endpoints as was done in 39b4f08, this also requires either setting
     `KARAPACE_VERSION` as container build arg or building
     karapace/version.py independently.
   - Add hadolint pre-commit check for linting Dockerfile.
   - Move to using Python base images for builder and final stage. This
     allows omitting installation of some build tools. It also allows
     moving to a more recent Python version, no longer being bound by
     what's in distro repositories. Wheel availability of some of our
     Python dependencies prevents us from moving to 3.11 for now.
   - Change installation approach to construct a virtualenv in the builder
     step, and copying it unaltered to the final stage, with dependencies
     and Karapace itself installed in it. This allows having even fewer
     layers in the final stage, and is simpler.
   - Introduces a _much_ stricter .dockerignore, ignoring files by default
     and explicitly including what's required. This makes sure changes in
     unrelated files does not evict layer cache. For example, a few files
     that previously erroneously evicted caches, because everything was
     included:
     - .git/*
     - .mypy_cache/*
     - container/Dockerfile itself
     - __pycache__/*
     - .idea/*

   

   aiven-anton committed May 4, 2023
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