Separate into multiple stages, at least during development.

Docker is pretty clever about not rebuilding stuff, but
simply having the 6GB XiLinx tarball in the build context
is painful, so let's avoid that as much as we can.

1 files changed, 3 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index 47f508b..69fcb57 100644
--- a/Makefile
+++ b/Makefile
@@ -1,2 +1,4 @@
 all:
-	docker build -t alpha-releng .
+	cd stage1; docker build -t xilinx:loadonly .
+	cd stage2; docker build -t xilinx:intalled .
+	cd stage3; docker build -t cryptech-alpha  .