Introduce job for granular GitHub mirroring

Create a openstack-mirror-on-github job that uses the
openstack-mirroring user on GitHub (and its SSH key) to
individually mirror repositories to the "openstack"
organization on GitHub.

That will allow us to turn off global replication of the
'openstack/* repositories at Gerrit-level.

Enable the new job on openstack/release-test as a test. It
should be able to run concurrently with Gerrit-wide
mirroring as this is an indempotent operation.

Once this merges and is validated, we can apply the job to
all official/active openstack projects, before disabling the
Gerrit-wide replication (see https://review.opendev.org/718478).

Change-Id: Ie7b4f520d6f47d56a71c812dcc06fd5d26da8fe0

zuul.d/jobs.yaml

@@ -744,6 +744,17 @@
       - npm_credentials
       - gpg_key
 
+- job:
+    name: openstack-mirror-on-github
+    parent: upload-git-mirror
+    description: Mirrors official projects to github's openstack org
+    vars:
+      git_mirror_repository: openstack/{{ zuul.project.short_name }}
+    secrets:
+      - name: git_mirror_credentials
+        secret: openstack-github-mirroring
+        pass-to-parent: true
+
 - job:
     name: propose-updates
     pre-run: playbooks/proposal/pre.yaml

zuul.d/projects.yaml

@@ -3911,6 +3911,12 @@
     templates:
       - publish-to-pypi
 
+- project:
+    name: openstack/release-test
+    post:
+      jobs:
+        - openstack-mirror-on-github
+
 - project:
     name: openstack/renderspec
     templates:

zuul.d/secrets.yaml

@@ -744,3 +744,81 @@
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           D9dOc6WmAHlzOJsvrZYWpizB2MW4ScVSUFbVe2d3FxzR6++mxM5t71D6tTqTW4=
+
+- secret:
+    name: openstack-github-mirroring
+    data:
+      user: openstack-mirroring
+      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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