Makefile: Add format target (#4226)

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

Makefile

@@ -1,5 +1,5 @@
 .DEFAULT_GOAL := all
-.PHONY: all images check-generated-files logcli loki loki-debug promtail promtail-debug loki-canary lint test clean yacc protos touch-protobuf-sources touch-protos
+.PHONY: all images check-generated-files logcli loki loki-debug promtail promtail-debug loki-canary lint test clean yacc protos touch-protobuf-sources touch-protos format
 .PHONY: docker-driver docker-driver-clean docker-driver-enable docker-driver-push
 .PHONY: fluent-bit-image, fluent-bit-push, fluent-bit-test
 .PHONY: fluentd-image, fluentd-push, fluentd-test
@@ -627,3 +627,9 @@ endif
 test-fuzz:
 	go test -timeout 30s -tags dev,gofuzz -cpuprofile cpu.prof -memprofile mem.prof  \
 		-run ^Test_Fuzz$$ github.com/grafana/loki/pkg/logql -v -count=1 -timeout=0s
+
+format:
+	find . $(DONT_FIND) -name '*.pb.go' -prune -o -name '*.y.go' -prune -o -name '*.rl.go' -prune -o \
+		-type f -name '*.go' -exec gofmt -w -s {} \;
+	find . $(DONT_FIND) -name '*.pb.go' -prune -o -name '*.y.go' -prune -o -name '*.rl.go' -prune -o \
+		-type f -name '*.go' -exec goimports -w -local github.com/grafana/loki {} \;