[CORD-795]
Docker image building/tagging/labeling, Makefile based build

Change-Id: I0d70ab01353999c0e0585547582af9c62d247987
diff --git a/milestones/.gitignore b/milestones/.gitignore
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--- /dev/null
+++ b/milestones/.gitignore
@@ -0,0 +1 @@
+*
diff --git a/milestones/README.md b/milestones/README.md
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+# Milestones
+
+This directory is used for Makefile milestone files, which are created on
+completion of a target and used for dependency management. See ../Makefile for
+more details.