Add Zuul job for mirroring to GitHub

Change-Id: I08a0d5747099d304f63a666e10dadb1539cd3169

.zuul.yaml

@@ -1,3 +1,66 @@
 - project:
     templates:
       - noop-jobs
+
+    post:
+      jobs:
+        - airship-kubernetes-entrypoint-upload-git-mirror
+
+- job:
+    name: airship-kubernetes-entrypoint-upload-git-mirror
+    parent: upload-git-mirror
+    description: Mirrors airship/kubernetes-entrypoint to airshipit/kubernetes-entrypoint
+    vars:
+      git_mirror_repository: airshipit/kubernetes-entrypoint
+    secrets:
+      - name: git_mirror_credentials
+        secret: airship-kubernetes-entrypoint-airshipit-github-secret
+        pass-to-parent: true
+
+- secret:
+    name: airship-kubernetes-entrypoint-airshipit-github-secret
+    data:
+      user: git
+      host: github.com
+      host_key: github.com ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAq2A7hRGmdnm9tUDbO9IDSwBK6TbQa+PXYPCPy6rbTrTtw7PHkccKrpp0yVhp5HdEIcKr6pLlVDBfOLX9QUsyCOV0wzfjIJNlGEYsdlLJizHhbn2mUjvSAHQqZETYP81eFzLQNnPHt4EVVUh7VfDESU84KezmD5QlWpXLmvU31/yMf+Se8xhHTvKSCZIFImWwoG6mbUoWf9nzpIoaSjB+weqqUUmpaaasXVal72J+UX2B+2RPW3RcT0eOzQgqlJL3RKrTJvdsjE3JEAvGq3lGHSZXy28G3skua2SmVi/w4yCE6gbODqnTWlg7+wC604ydGXA8VJiS5ap43JXiUFFAaQ==
+      ssh_key: !encrypted/pkcs1-oaep
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