Add support for --label flag to docker compose up

[Pnkcaht]

What I did

Added support for the --label flag to docker compose up, allowing users to add or override labels on all services when starting a Compose stack.

This brings compose up in line with existing behavior from other commands (such as compose run and compose create), making it possible to attach arbitrary metadata to a full Compose stack at runtime.

The provided labels are applied before container creation, ensuring they are correctly propagated to all created containers.

Related issue

Fixes #13436

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

🐜 An ant carefully tagging everything in its path — just like Compose now labels all services when bringing a stack up.

Notes

• Adds --label flag support to docker compose up
• Allows labeling all services in a stack at startup
• Reuses existing label parsing and application logic
• No behavior change when the flag is not used
• Fully backward compatible

Screenshot (Test)

[ndeloof]

👎 I'm not favorable to this feature request.

labels in the compose file can be declared with value interpolated. Doing so the compose.yaml has a full definition of services, with all expected labels, just the value is dynamic and can be tweaked by user at runtime.

[Pnkcaht]

👎 I'm not favorable to this feature request.

labels in the compose file can be declared with value interpolated. Doing so the compose.yaml has a full definition of services, with all expected labels, just the value is dynamic and can be tweaked by user at runtime.

Thank you for your feedback @ndeloof .
I can adjust or discard this if you feel it's not the right direction.