Caches pip download and env

[Relm-Arrowny]

#650 #629 I made an attempt caching the python env, it gain you about 30-90 per work flow build not sure if it is worth it or not. We can probably play the same game with the container part of the work-flow which is where the real bottle neck is.

@stan-dot Anyway see what you think,

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.62%. Comparing base (3a6693b) to head (629aead).
Report is 1 commits behind head on 629-speedup-github-actions.

Additional details and impacted files

@@                     Coverage Diff                     @@
##           629-speedup-github-actions     #656   +/-   ##
===========================================================
  Coverage                       92.62%   92.62%           
===========================================================
  Files                              35       35           
  Lines                            1654     1654           
===========================================================
  Hits                             1532     1532           
  Misses                            122      122           

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[stan-dot]

thanks,

this looks good

Monday I'll look into the container part - this 'cache-from:' is a field I missed at first
https://docs.docker.com/build/cache/backends/gha/

- name: Build and push
  uses: docker/build-push-action@v6
  with:
    context: .
    push: true
    tags: "<registry>/<image>:latest"
    cache-from: type=gha
    cache-to: type=gha,mode=max
    github-token: ${{ secrets.MY_CUSTOM_TOKEN }}
    
    ```