Set up main -> v2, v2 -> v1, and v2 -> main merges

.github/workflows/post-release-mergeback.yml

@@ -15,6 +15,7 @@ on:
   push:
     branches:
       - v1
+      - v2
 
 jobs:
   merge-back:
@@ -90,7 +91,7 @@ jobs:
           git push origin --follow-tags "$VERSION"
 
       - name: Create mergeback branch
-        if: steps.check.outputs.exists != 'true'
+        if: steps.check.outputs.exists != 'true' && contains(github.ref, 'v2')
         env:
           VERSION: "${{ steps.getVersion.outputs.version }}"
           NEW_BRANCH: "${{ steps.getVersion.outputs.newBranch }}"

.github/workflows/update-release-branch.yml

@@ -1,5 +1,13 @@
 name: Update release branch
-on: workflow_dispatch
+on:
+  # You can trigger this workflow via workflow dispatch to start a release.
+  # This will open a PR to update the v2 release branch.
+  workflow_dispatch:
+
+  # When the v2 release is complete, this workflow will open a PR to update the v1 release branch.
+  push:
+    branches:
+      - v2
 
 jobs:
   update:
@@ -27,11 +35,22 @@ jobs:
         git config --global user.email "github-actions@github.com"
         git config --global user.name "github-actions[bot]"
 
-    - name: Update release branch
+    - name: Update v2 release branch
+      if: github.event_name == 'workflow_dispatch'
       run: |
         python .github/update-release-branch.py \
           --github-token ${{ secrets.GITHUB_TOKEN }} \
           --repository-nwo ${{ github.repository }} \
           --source-branch main \
+          --target-branch v2 \
+          --conductor ${GITHUB_ACTOR}
+
+    - name: Update v1 release branch
+      if: github.event_name == 'push'
+      run: |
+        python .github/update-release-branch.py \
+          --github-token ${{ secrets.GITHUB_TOKEN }} \
+          --repository-nwo ${{ github.repository }} \
+          --source-branch v2 \
           --target-branch v1 \
           --conductor ${GITHUB_ACTOR}