Update building stuff

- Add a Makefile with common targets (binary, test, validate, ..)
- Use docker to build it (isolated)

And update circleci to work with the new Makefile..

Signed-off-by: Vincent Demeester <vincent@sbr.pm>

Makefile

@@ -0,0 +1,48 @@
+.PHONY: all
+
+TRAEFIK_ENVS := \
+	-e OS_ARCH_ARG \
+	-e OS_PLATFORM_ARG \
+	-e TESTFLAGS
+
+BIND_DIR := $(if $(DOCKER_HOST),,dist)
+TRAEFIK_MOUNT := $(if $(BIND_DIR),-v "$(CURDIR)/$(BIND_DIR):/go/src/github.com/emilevauge/traefik/$(BIND_DIR)")
+
+GIT_BRANCH := $(shell git rev-parse --abbrev-ref HEAD 2>/dev/null)
+TRAEFIK_DEV_IMAGE := traefik-dev$(if $(GIT_BRANCH),:$(GIT_BRANCH))
+TRAEFIK_IMAGE := $(if $(REPO),$(REPO),"emilevauge/traefik")
+
+DOCKER_RUN_TRAEFIK := docker run $(if $(CIRCLECI),,--rm) -it $(TRAEFIK_ENVS) $(TRAEFIK_MOUNT) "$(TRAEFIK_DEV_IMAGE)"
+
+default: binary
+
+binary: build
+	$(DOCKER_RUN_TRAEFIK) ./script/make.sh generate binary
+
+test: build
+	$(DOCKER_RUN_TRAEFIK) ./script/make.sh generate test-unit test-integration
+
+test-unit: build
+	$(DOCKER_RUN_TRAEFIK) ./script/make.sh generate test-unit
+
+test-integration: build
+	$(DOCKER_RUN_TRAEFIK) ./script/make.sh generate binary test-integration
+
+validate: build
+	$(DOCKER_RUN_TRAEFIK) ./script/make.sh validate-gofmt
+
+validate-gofmt: build
+	$(DOCKER_RUN_TRAEFIK) ./script/make.sh validate-gofmt
+
+build: dist
+	docker build -t "$(TRAEFIK_DEV_IMAGE)" -f build.Dockerfile .
+
+image: build
+	if ! [ -a dist/traefik_linux-386 ] ; \
+	then \
+		$(DOCKER_RUN_TRAEFIK) ./script/make.sh generate binary; \
+	fi;
+	docker build -t $(TRAEFIK_IMAGE) .
+
+dist:
+	mkdir dist