add build

Makefile

@@ -1,4 +1,22 @@
-.PHONY: check
+.PHONY: check build publish
+
+build:
+	$(MAKE) -C evening_detective_server build-linux
+	npm --prefix evening_detective_frontend run build
+
+publish:
+	@test -n "$(MSG)" || (echo 'Usage: make publish MSG="commit message"' >&2; exit 1)
+	@$(MAKE) build
+	@set -e; \
+	for repo in . evening_detective_server evening_detective_frontend; do \
+		git -C "$$repo" add -A; \
+		if git -C "$$repo" diff --cached --quiet; then \
+			echo "$$repo: no changes"; \
+			continue; \
+		fi; \
+		git -C "$$repo" commit -m "$(MSG)"; \
+		git -C "$$repo" push; \
+	done
 
 check:
 	$(MAKE) -C evening_detective_server test