chore: improve makefile

GNUmakefile

@@ -1,6 +1,26 @@
-default: testacc
+default: build
+
+build:
+	go build -v ./...
+
+install: build
+	go install -v ./...
+
+# See https://golangci-lint.run/
+lint:
+	golangci-lint run
+
+# Generate docs and copywrite headers
+generate:
+	cd tools; go generate ./...
+
+fmt:
+	gofmt -s -w -e .
+
+test:
+	go test -v -cover -timeout=120s -parallel=4 ./...
 
-# Run acceptance tests
-.PHONY: testacc
 testacc:
-	TF_ACC=1 go test ./... -v $(TESTARGS) -timeout 120m
+	TF_ACC=1 go test -v -cover -timeout 120m ./...
+
+.PHONY: build install lint generate fmt test testacc