install build-essential to compile dependencies and use multi-stage build #2582
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regex
pinned version: not necessary as we can build from source if wheels are missingCopying
/root/.local/
installs only black's built Python dependencies (< 20 MB).So the image is barely larger than python:3-slim base image
Tested locally and in my fork GitHub Actions: https://github.com/vbarbaresi/black/runs/4062490765?check_suite_focus=true