SHIP-0038: Run CI on Release Branches

Update our CI-oriented GitHub actions to run when commits merge in a
`release-v*` branch, or a pull request is opened against a `release-v*`
branch. With this change, future release branches will automatically
have CI checks enabled. This commit should be backported to enable CI
in a prior release branch.

This implements a portion of SHIP-0038.

Signed-off-by: Adam Kaplan <adam.kaplan@redhat.com>

.github/workflows/ci.yml

@@ -3,12 +3,14 @@ on:
   pull_request:
     branches:
     - main
+    - "release-v*" # release branches
   push:
     paths-ignore:
     - 'README.md'
     - 'docs/**'
     branches: 
     - main
+    - "release-v*" # release branches
 
 jobs:
   unit:

.github/workflows/release-notes-linter.yaml

@@ -5,6 +5,7 @@ on:
   pull_request:
     branches:
       - main
+      - "release-v*" # release branches
 
 jobs:
   release-note-linter:

.github/workflows/verify.yaml

@@ -6,9 +6,11 @@ on:
       - '**'
     branches:
       - main
+      - "release-v*" # release branches
   pull_request:
     branches:
       - main
+      - "release-v*" # release branches
 
 permissions:
   contents: read