add basic test infrastructure

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

Makefile

@@ -1,17 +1,47 @@
+.PHONY: all binary build clean install install-binary man shell test-integration
+
 export GO15VENDOREXPERIMENT=1
 
 BINDIR=${DESTDIR}/usr/bin/
 MANDIR=${DESTDIR}/usr/share/man
 
-all:
-	go build -o skopeo .
-	go-md2man -in man/skopeo.1.md -out skopeo.1
+GIT_BRANCH := $(shell git rev-parse --abbrev-ref HEAD 2>/dev/null)
+DOCKER_IMAGE := skopeo-dev$(if $(GIT_BRANCH),:$(GIT_BRANCH))
+# set env like gobuildtag?
+DOCKER_FLAGS := docker run --rm -i #$(DOCKER_ENVS)
+# if this session isn't interactive, then we don't want to allocate a
+# TTY, which would fail, but if it is interactive, we do want to attach
+# so that the user can send e.g. ^C through.
+INTERACTIVE := $(shell [ -t 0 ] && echo 1 || echo 0)
+ifeq ($(INTERACTIVE), 1)
+	DOCKER_FLAGS += -t
+endif
+DOCKER_RUN_DOCKER := $(DOCKER_FLAGS) "$(DOCKER_IMAGE)"
 
-install:
-	install -d -m 0755 ${BINDIR}
-	install -m 755 skopeo ${BINDIR}
-	install -m 644 skopeo.1 ${MANDIR}/man1/
+all: man binary
+
+binary:
+	go build -o ${DEST}skopeo .
+
+build-container:
+	docker build ${DOCKER_BUILD_ARGS} -t "$(DOCKER_IMAGE)" .
 
 clean:
 	rm -f skopeo
 	rm -f skopeo.1
+
+install: install-binary
+	install -m 644 skopeo.1 ${MANDIR}/man1/
+
+install-binary:
+	install -d -m 0755 ${BINDIR}
+	install -m 755 skopeo ${BINDIR}
+
+man:
+	go-md2man -in man/skopeo.1.md -out skopeo.1
+
+shell: build-container
+	$(DOCKER_RUN_DOCKER) bash
+
+test-integration: build-container
+	$(DOCKER_RUN_DOCKER) integration/test.sh