CORD-536 updated to support the setting of repo via vars

Change-Id: I84988b634967d8be2e5a9f3a79352be5efa9c0c0
diff --git a/roles/docker/files/docker_apt_key.gpg b/roles/docker/files/docker_apt_key.gpg
new file mode 100644
index 0000000..bf09e4c
--- /dev/null
+++ b/roles/docker/files/docker_apt_key.gpg
@@ -0,0 +1,64 @@
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