[Docs] Suggestion to add information about environment

[benjaoming]

Signed-off-by: Benjamin Balder Bach benjamin@overtag.dk

What I did

I wondered about what happens to a container's environment when you launch commands via exec. Is it preserved or do I have to re-do it.

Turns out for me (Compose v2) it's nicely preserved.

Added a little general tip for debugging the environment on a running container.

[laurazard]

I'm concerned this change will introduce more confusion than clarity.

Running compose exec [...] doesn't launch a new container, it executes a command in a running container, so Environment from existing configuration is applied isn't technically true as compose exec isn't applying any new environment config, that simply already exists in the running container. Maybe we can make that clear, and a new PR can be made for that, but I don't think this exact change should be made.

[benjaoming]

@laurazard that's true, "preserved" is the right word here 👍 Thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 19.55%. Comparing base (e42673d) to head (3d4cb0b).
Report is 1066 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main   #10095       +/-   ##
===========================================
- Coverage   76.98%   19.55%   -57.44%     
===========================================
  Files           2      104      +102     
  Lines         252     9104     +8852     
===========================================
+ Hits          194     1780     +1586     
- Misses         51     7137     +7086     
- Partials        7      187      +180     

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