Move containers directory to alpine directory

Not using this with new tool, so leave for editions.

Signed-off-by: Justin Cormack <justin.cormack@docker.com>

test/Makefile

@@ -1,23 +0,0 @@
-default: test.img
-
-RIDDLER=mobylinux/riddler:893c93bf54bc037f6952886330d5ba58746ace37@sha256:3d4a61555110be4b6e8ff6bcdcf5f8aa24d64564eb4162ea4e580d8916d083cc
-
-TEST_IMAGE=mobylinux/test:1a8c5de8ebfa27962f7623846e8538babdf48e76@sha256:7dada68bcb76e897a7a7aa2a28b6b1808b04e8eda7319e1da97bd1cff9952fee
-
-container.tar:
-	docker run --rm -v /var/run/docker.sock:/var/run/docker.sock $(RIDDLER) \
-	  $(TEST_IMAGE) /test --cap-drop all --cap-add SYS_ADMIN -e HOME=/tmp \
-	  -v /tmp:/tmp -v /var/run/docker.sock:/var/run/docker.sock:ro \
-	  -v /usr/bin/docker:/usr/bin/docker:ro \
-	  -v /etc/resolv.conf:/etc/resolv.conf:ro \
-	  --net host --read-only $(TEST_IMAGE) /bin/sh /bin/test.sh >$@
-
-TAR2INITRD_IMAGE=mobylinux/tar2initrd:d5711601eb5b89de0f052d87365e18388ff3f1b5@sha256:58d377e65845f91400e173ce9fca93462f2f237947eef2b0d2c17bb4f2da5ee8
-
-test.img: container.tar
-	cat $^ | docker run --rm --read-only --net=none --log-driver=none --tmpfs /tmp -i $(TAR2INITRD_IMAGE) > $@
-
-clean:
-	rm -f container.tar test.img
-
-.DELETE_ON_ERROR: