feat: log commands in Docker entrypoint

[rolodato]

Thanks for submitting a PR! Please check the boxes below:

• I have added information to docs/ if required so people know about the feature!
• I have filled in the "Changes" section below?
• I have filled in the "How did you test this code" section below?
• I have used a Conventional Commit title for this Pull Request

Changes

Add logging to the Docker entrypoint script, and fix shellcheck issues.

https://github.com/koalaman/shellcheck/wiki/SC2039
https://github.com/koalaman/shellcheck/wiki/SC2112
https://github.com/koalaman/shellcheck/wiki/SC2039

How did you test this code?

% docker run -it ghcr.io/flagsmith/flagsmith:pr-4826 --help
+ '[' --help '=' migrate ]
+ '[' --help '=' serve ]
+ '[' --help '=' run-task-processor ]
+ '[' --help '=' migrate-and-serve ]
+ default --help
+ python manage.py --help

Type 'manage.py help <subcommand>' for help on a specific subcommand.

Available subcommands:
[...]

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Nov 11, 2024 10:02pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)			Nov 11, 2024 10:02pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)			Nov 11, 2024 10:02pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-4826	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-4826	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-4826	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-4826	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4826	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4826	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-58168 was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.33%. Comparing base (e6f1bac) to head (1858304).
Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4826   +/-   ##
=======================================
  Coverage   97.33%   97.33%           
=======================================
  Files        1180     1180           
  Lines       41223    41224    +1     
=======================================
+ Hits        40123    40124    +1     
  Misses       1100     1100           

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