Adds a makefile to ease builds/tests locally and adds a dockerignore file for faster docker builds (resmoio#154)

The makefile is for convenience purposes and the dockerignore file reduces the context to be passed
to Docker daemon.

Author: ronaknnathani

Makefile

@@ -0,0 +1,28 @@
+.PHONY: build
+build: tidy ## Build the CLI
+	go build
+
+build-image: ## Build the Docker image
+	docker build -t kubernetes-event-exporter .
+
+.PHONY: fmt
+fmt: ## Run go fmt against code
+	gofmt -s -l -w .
+
+.PHONY: vet
+vet: ## Run go vet against code
+	go vet ./...
+
+tidy: ## Run go mod tidy
+	go mod tidy
+
+test: tidy ## Run tests
+	go test -cover -mod=mod -v ./...
+
+clean: ## Delete go.sum and clean mod cache
+	go clean -modcache
+	rm go.sum
+
+.PHONY: help
+help: ## Display this help.
+	@cat $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*##"; printf "\nUsage:\n  make \033[36m<target>\033[0m\n"} /^[a-zA-Z_0-9-]+:.*?##/ { printf "  \033[36m%-15s\033[0m %s\n", $$1, $$2 } /^##@/ { printf "\n\033[1m%s\033[0m\n", substr($$0, 5) } '

event-exporter.dockerignore

@@ -0,0 +1,5 @@
+# Ignore everything
+*
+
+# Include pkg directory
+!pkg/