Makefile: skip vendor directory when running linter
As we now vendor dependencies, we should skip linting vendored packages, since
it's not our responsibility to have them properly formatted and also it takes a while
to run it.
@@ -36,7 +36,7 @@ build-slim:
.PHONY: test
test: check-go-format run-unit-tests
-GOFORMAT_FILES := $(shell find . -name '*.go')
+GOFORMAT_FILES := $(shell find . -name '*.go' | grep -v '^./vendor')
.PHONY: check-go-format
## Exits with an error if there are files whose formatting differs from gofmt's
