chore: use debian base images instead of alpine

[matt-codecov]

fixes codecov/engineering-team#1242

with an alpine/musl image we have to build more packages from source. grpcio takes an eternity to build for example

also apparently alpine/musl images have DNS resolution problems

this uses an official "slim" python image based on debian stable. from a quick glance at uncompressed image sizes on my local machine, this is actually 300mb smaller:

i have not rigorously tested this but it seems okay

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.78%. Comparing base (db019c3) to head (fdc4ff3).

❗ Current head fdc4ff3 differs from pull request most recent head eb70a3f. Consider uploading reports for the commit eb70a3f to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #416     +/-   ##
=======================================
- Coverage   95.79   95.78   -0.01     
=======================================
  Files        757     757             
  Lines      17293   17332     +39     
=======================================
+ Hits       16565   16601     +36     
- Misses       728     731      +3     

Flag	Coverage Δ
unit	96.09% <ø> (+<0.01%)	⬆️
unit-latest-uploader	96.09% <ø> (+<0.01%)	⬆️

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[codecov-qa]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.42%. Comparing base (2d58144) to head (bd2b306).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #416   +/-   ##
=======================================
  Coverage   91.42%   91.42%           
=======================================
  Files         602      602           
  Lines       16218    16218           
=======================================
  Hits        14828    14828           
  Misses       1390     1390           

Flag	Coverage Δ
unit	91.42% <ø> (ø)
unit-latest-uploader	91.42% <ø> (ø)

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[codecov-public-qa]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.42%. Comparing base (2d58144) to head (bd2b306).

@@           Coverage Diff           @@
##             main     #416   +/-   ##
=======================================
  Coverage   91.42%   91.42%           
=======================================
  Files         602      602           
  Lines       16218    16218           
=======================================
  Hits        14828    14828           
  Misses       1390     1390           

Flag	Coverage Δ
unit	91.42% <ø> (ø)
unit-latest-uploader	91.42% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

[codecov-staging]

Codecov Report

All modified and coverable lines are covered by tests ✅

📢 Thoughts on this report? Let us know!

[trent-codecov]

This generally looks good. Can you change the shebang for prod.sh etc? Then lets merge this to staging and test it out further.