Travis CI gimme Docker image, useful debugging failed jobs
Example usage:
GIMME_IMAGE := reg-gimme
docker build --rm --force-rm -f Dockerfile -t $(GIMME_IMAGE) .
docker run --rm -i $(DOCKER_FLAGS) \
-v $PWD:/go/src/github.com/codem8s/2fy \
--workdir /go/src/github.com/codem8s/2fy \
-v /tmp:/tmp \
$(GIMME_IMAGE) \
make