removed alpine image

[Yanni8]

Autogen currently uses the alpine Python Docker image to execute code.

This can result in unexpected behaviors: https://pythonspeed.com/articles/alpine-docker-python/

I think that it would make sense to replace alpine with slim

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (adbfb20) 32.08% compared to head (b532019) 41.96%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1279      +/-   ##
==========================================
+ Coverage   32.08%   41.96%   +9.87%     
==========================================
  Files          32       32              
  Lines        4394     4394              
  Branches     1025     1080      +55     
==========================================
+ Hits         1410     1844     +434     
+ Misses       2867     2401     -466     
- Partials      117      149      +32     

Flag	Coverage Δ
unittests	41.89% <ø> (+9.85%)	:arrow_up:

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[qingyun-wu]

@sonichi any specific reason why we choose to put alpine at the very beginning? If not, I believe this suggested change is reasonable.