Fix workflow & add makefile

Makefile

@@ -0,0 +1,22 @@
+# =====================
+# Build new application
+# =====================
+
+
+.PHONY: tag-build
+tag-build: ## DEV   : Build a prod version with a timestamped tag
+	@export TIMESTAMP=build_`date +"%G-%m-%d_%Hh%M"`; \
+	echo TAG = $$TIMESTAMP; \
+	git tag $$TIMESTAMP; \
+	git push origin $$TIMESTAMP;
+
+# ===============
+# Deployment tags
+# ===============
+
+.PHONY: tag-deploy
+tag-deploy: ## DEV   : Set tag to current HEAD to deploy in production
+	@export TIMESTAMP=deploy_`date +"%G-%m-%d_%Hh%M"`; \
+	echo TAG = $$TIMESTAMP; \
+	git tag $$TIMESTAMP; \
+	git push origin $$TIMESTAMP;