Add task to push local image

.gitignore

 *~
 *.orig
 /.idea
+/archlinux.tar

Dockerfile

 FROM scratch
-ADD archlinux.tar.xz /
+ADD archlinux.tar /
 CMD ["/usr/bin/bash"]

Makefile

+DOCKER_USER := 'pierres'
+DOCKER_IMAGE := 'archlinux'
+
 rootfs:
 	$(eval TMPDIR := $(shell mktemp -d))
 	pacstrap -C /usr/share/devtools/pacman-extra.conf -c -d -G -M $(TMPDIR) $(shell cat packages)
-	cp -rvp --backup --suffix=.pacnew rootfs/* $(TMPDIR)/
+	cp -rp --backup --suffix=.pacnew rootfs/* $(TMPDIR)/
 	arch-chroot $(TMPDIR) locale-gen
 	arch-chroot $(TMPDIR) pacman-key --init
 	arch-chroot $(TMPDIR) pacman-key --populate archlinux
-	tar --numeric-owner --xattrs --acls --exclude-from=exclude -C $(TMPDIR) -c . -Jvf archlinux.tar.xz
+	tar --numeric-owner --xattrs --acls --exclude-from=exclude -C $(TMPDIR) -c . -f archlinux.tar
 	rm -rf $(TMPDIR)
 
 docker-image: rootfs
-	docker build -t pierres/archlinux .
+	docker build -t $(DOCKER_USER)/$(DOCKER_IMAGE) .
+
+docker-push: docker-image
+	docker login -u $(DOCKER_USER)
+	docker push $(DOCKER_USER)/$(DOCKER_IMAGE)
 
-.PHONY: rootfs docker-image
+.PHONY: rootfs docker-image docker-push