Merge pull request #15632 from overleaf/jpa-prod-target

[web] use explicit docker image target for production build

GitOrigin-RevId: 7d59ce709a5234b44da9e3034118c760c1a3d427

services/web/Makefile

@@ -541,6 +541,7 @@ build:
 		--cache-from $(IMAGE_CI)-webpack \
 		--cache-from $(IMAGE_REPO_FINAL) \
 		--tag $(IMAGE_REPO_FINAL) \
+		--target app \
 		--file Dockerfile \
 		../..