Merge "Add release process document"

RELEASE.rst

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+Fuel CCP Installer release process
+----------------------------------
+
+In order to tag a release of MCP Installer, the following items must be set:
+* Pinned Fuel-devops version
+* Pinned Kargo commit
+* Pinned Docker version
+* Pinned Calico version
+* Pinned Kubernetes hyperkube image
+* Pinned etcd version
+* Pinned Ansible version
+
+List of items to check off before tagging release:
+* CI passes (pep8, pytest, docs, and functional test)
+* HA destructive test:
+  * disable first master, restart kubelet on all nodes, check kubectl get nodes,
+    restart first master, check kubectl get nodes
+* QA signoff
+* fuel-devops version
+* test coverage is green
+* CCP team signoff
+* Fuel-ccp deployment succeeds and contains no blocker bugs
+
+Estimated timeline: 3 days to propose release and obtain signoff.
+
+Technical Details
+^^^^^^^^^^^^^^^^^
+
+Master branch of fuel-ccp-installer will principally point to “master” commit
+of Kargo, except during release time.
+
+Release manager will create a commit to fuel-ccp-installer, pinning
+KARGO_COMMIT to either a tagged release of Kargo or a specific commit.
+
+After all signoffs are obtained, the commit will be merged.
+
+Release manager will create a tag in Gerrit for the new release.
+
+Release manager creates another commit to un-pin KARGO_COMMIT back to “master”
+gitref.