Docker: fixed git references.

Author: thresheek

pkg/docker/Makefile

@@ -84,7 +84,7 @@ build-%: Dockerfile.%
 	docker build --no-cache -t unit:$(VERSION)-$* -f Dockerfile.$* .
 
 library:
-	@echo "# this file is generated via https://github.com/nginx/unit/$(shell git describe --always --abbrev=0 HEAD)/pkg/docker/Makefile"
+	@echo "# this file is generated via https://github.com/nginx/unit/blob/$(shell git describe --always --abbrev=0 HEAD)/pkg/docker/Makefile"
 	@echo ""
 	@echo "Maintainers: Unit Docker Maintainers <[email protected]> (@nginx)"
 	@echo "GitRepo: https://github.com/nginx/unit.git"
@@ -94,7 +94,7 @@ library:
 		TAGS="$$(echo $$TAGS | tr " " "\n" | sort -u -r | tr "\n" "," | sed "s/,/, /g")"; \
 		echo "Tags: $(VERSION)-$$mod, $${TAGS%, }"; \
 		echo "Architectures: amd64, arm64v8"; \
-		echo "GitFetch: refs/heads/packaging"; \
+		echo "GitFetch: refs/heads/branches/packaging"; \
 		echo "GitCommit: $(shell git describe --always --abbrev=0 HEAD)"; \
 		echo "Directory: pkg/docker"; \
 		echo "File: Dockerfile.$$mod"; \