add vet command and step to pipeline

.gitlab-ci.yml

@@ -19,6 +19,12 @@ format:
   script:
     - make check/fmt
 
+vet:
+  extends: .go_template
+  stage: test
+  script:
+    - make vet
+
 test:
   extends: .go_template
   stage: test

Makefile

@@ -20,6 +20,11 @@ update:
 test: download
 	go test ./... -v -race
 
+# Look for "suspicious constructs" in source code
+.PHONY: vet
+vet: download
+	go vet ./...
+
 # Format code
 .PHONY: fmt
 fmt: download