Fix Docker builds by adding py3-setuptools to Dockerfile

[Pierre-Gilles]

Pull Request check-list

To ensure your Pull Request can be accepted as fast as possible, make sure to review and check all of these items:

• If your changes affects code, did your write the tests?
• Are tests passing? (npm test on both front/server)
• Is the linter passing? (npm run eslint on both front/server)
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• If you are adding a new features/services, did you run integration comparator? (npm run compare-translations on front)

Description of change

Fix docker builds

[cloudflare-pages]

Deploying gladys-plus with    Cloudflare Pages

Latest commit:	5d6f4e5
Status:	✅  Deploy successful!
Preview URL:	https://2420239d.gladys-plus.pages.dev
Branch Preview URL:	https://fix-docker-builds.gladys-plus.pages.dev

View logs

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.40%. Comparing base (09a7987) to head (5d6f4e5).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2095   +/-   ##
=======================================
  Coverage   98.40%   98.40%           
=======================================
  Files         858      858           
  Lines       14081    14081           
=======================================
  Hits        13857    13857           
  Misses        224      224           

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[relativeci]

#2600 Bundle Size — 10.14MiB (0%).

5d6f4e5(current) vs 09a7987 master#2576(baseline)

Warning

Bundle contains 3 duplicate packages – View duplicate packages

Bundle metrics  no changes

	Current #2600	Baseline #2576
Initial JS	5.46MiB	5.46MiB
Initial CSS	302.96KiB	302.96KiB
Cache Invalidation	0%	63.14%
Chunks	51	51
Assets	170	170
Modules	1480	1480
Duplicate Modules	21	21
Duplicate Code	0.82%	0.82%
Packages	124	124
Duplicate Packages	3	3

Bundle size by type  no changes

	Current #2600	Baseline #2576
JS	7.24MiB	7.24MiB
IMG	2.46MiB	2.46MiB
CSS	319.75KiB	319.75KiB
Fonts	93.55KiB	93.55KiB
Other	17.53KiB	17.53KiB
HTML	13.58KiB	13.58KiB

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