ci: fix docker image entrypoint

[AndreyMarkinPPC]

• Copy executable scripts to final image
• Make image smaller
• Add :latest tag

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.51%. Comparing base (5ebb9d2) to head (d46015a).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #181      +/-   ##
==========================================
+ Coverage   88.23%   88.51%   +0.28%     
==========================================
  Files          61       64       +3     
  Lines        2600     2664      +64     
==========================================
+ Hits         2294     2358      +64     
  Misses        306      306              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.