fix: Filter only built images when tagging as latest in CD

Problem: docker compose config --images returns ALL images including
external ones (rabbitmq, appinsights, azurite) that are not built by us.
Attempting to tag these as 'latest' fails with 'No such image' error.

Solution: Filter images by DOCKER_USERNAME to only tag our built images
(ascoderu/opwenserver_app, ascoderu/opwenwebapp, etc.)

This fixes the CD pipeline failure when running release-docker target.

Author: dahagag

makefile

@@ -78,7 +78,7 @@ release-docker:
 	export VERSION="$(DOCKER_TAG)"; \
 	export DOCKER_REPO="$(DOCKER_USERNAME)"; \
 	docker compose build $(DOCKER_BUILD_ARGS) && \
-	docker compose config --images | grep -v "^$$" | while read image; do \
+	docker compose config --images | grep "$(DOCKER_USERNAME)" | while read image; do \
 		docker tag "$$image" "$${image%:*}:latest"; \
 	done