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What I did
Right now
docker compose build
ordocker compose up --build
does not emit events. The only way to notice that something was built is by looking at stdout. The only case events are written (to stderr) is when using BuildKit in dry-mode (there's special code to emit some fake events in that case).This PR makes building emit proper events (one before and one after building). This improves using
docker compose
from other programs. (Especially together with #11478.)Related issue
Fixes #11403.
(not mandatory) A picture of a cute animal, if possible in relation to what you did