Makefile: add 'vet' target

Add a target that runs 'go vet', to be used in the CI workflow to replace
direct invocations of 'go'.

Signed-off-by: Victoria Dye <[email protected]>

Author: vdye

Makefile

@@ -42,6 +42,10 @@ doc:
 	@scripts/make-docs.sh --docs="$(CURDIR)/docs/man" \
 			      --output="$(DOCDIR)"
 
+.PHONY: vet
+vet:
+	GOOS="$(GOOS)" GOARCH="$(GOARCH)" go vet ./...
+
 # Testing targets
 .PHONY: test
 test: build