Fix CI build and execute it on master branch

.github/workflows/build.yml

@@ -1,6 +1,9 @@
 name: build
 
 on:
+  push:
+    branches: 
+      - master
   pull_request:
     branches:
       - '*'

Makefile

@@ -65,7 +65,7 @@ release: ## goreleaser --snapshot --skip-publish --rm-dist
 diff: ## git diff
 	$(call print-target)
 	git diff --exit-code
-	test -z "`git status --porcelain | tee /dev/tty`"
+	test -z "`git status --porcelain`" || (git status --porcelain && exit 1)
 
 .PHONY: docker
 docker: ## run in golang container, example: make docker run="make all"