test: add a fully containerized (via Compose) e2e setup

[milas]

What I did dind.compose.yaml has a Docker-in-Docker setup, which is then referenced via include in e2e.compose.yaml.

Not all tests currently pass, as some rely on bind mounts, for example.

(not mandatory) A picture of a cute animal, if possible in relation to what you did

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 58.28%. Comparing base (aeb835a) to head (9d13cba). Report is 449 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10980      +/-   ##
==========================================
- Coverage   58.30%   58.28%   -0.02%     
==========================================
  Files         124      124              
  Lines       10912    10912              
==========================================
- Hits         6362     6360       -2     
- Misses       3922     3923       +1     
- Partials      628      629       +1     

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[ndeloof]

obsolete