feat: run entrypoint as s6 supervised service

[matteriben]

Description:
Run entrypoint.sh as s6 supervised service to provide a structured path to perform setup/teardown through s6 supervision.

Related issue(s):

Fixes #15942

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (61bf732)	109348	67499	61.73%
Head commit (556620e)	109348 (+0)	67499 (+0)	61.73% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#15944)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.19%. Comparing base (61bf732) to head (556620e).
Report is 78 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop   #15944   +/-   ##
==========================================
  Coverage      58.19%   58.19%           
  Complexity     21642    21642           
==========================================
  Files           2791     2791           
  Lines         109531   109531           
  Branches       11204    11204           
==========================================
  Hits           63746    63746           
  Misses         41922    41922           
  Partials        3863     3863