adding golang lint (#22)

Makefile

@@ -1,6 +1,7 @@
 GOHOSTOS:=$(shell go env GOHOSTOS)
 GOPATH:=$(shell go env GOPATH)
 VERSION=$(shell git describe --tags --always)
+DOCKER ?= podman
 
 ifeq ($(GOHOSTOS), windows)
 	#the `find.exe` is different from `find` in bash/shell.
@@ -87,6 +88,13 @@ kind/spicedb:
 # run api locally
 run: build
 	 ./bin/ciam-rebac -conf configs
+
+# run go linter with the repositories lint config
+.PHONY: lint
+lint:
+	@echo "Linting code."
+	@$(DOCKER) run -t --rm -v $(PWD):/app -w /app golangci/golangci-lint golangci-lint run -v
+
 # show help
 help:
 	@echo ''