make: Create make release command to tag and update mapic-release…

… branch (#123)

* makefile: Create release command with input check

* makefile: Actually tag && push the new version

* makefile: Do it on a test branch

* makefile: Fix mapic-release fast-forward command

Must run it from the destination branch, so added a
confirmation before changing user current branch.

* makefile: Move back to the real branch

Makefile

@@ -48,3 +48,22 @@ localdocker:
 .PHONY: stream-monitor
 monitor:
 	go build -ldflags="$(ldflags)" cmd/stream-monitor/stream-monitor.go
+
+.PHONY: release
+release:
+	@if [[ ! "$(version)" =~ ^[0-9]+\.[0-9]+\.[0-9]+(-.+)?$$ ]]; then \
+		echo "Must provide semantic version as arg to make." ; \
+		echo "e.g. make release version=1.2.3-beta" ; \
+		exit 1 ; \
+	fi
+	@git diff --quiet || { echo "Git working directory is dirty."; exit 1 ; }
+
+	git tag -a v$(version) -m "Release v$(version)"
+	git push origin v$(version)
+
+	@echo -n "Release mist-api-connector? [y] "
+	@read ans && [ $${ans:-y} = y ] || { echo "Mapic release aborted, branch not fast-forwarded."; exit 1 ; }
+
+	git checkout mapic-release
+	git merge --ff-only v$(version)
+	git push origin mapic-release