Merge pull request #12616 from hashicorp/kevin/backport

feat: backport-assistant

.github/workflows/backport.yml

@@ -0,0 +1,22 @@
+---
+name: Backport Assistant Runner
+
+on:
+  pull_request_target:
+    types:
+      - closed
+      - labeled
+
+jobs:
+  backport:
+    if: github.event.pull_request.merged
+    runs-on: ubuntu-latest
+    container: hashicorpdev/backport-assistant:0.2.3
+    steps:
+      - name: Backport changes to stable-website
+        run: |
+          backport-assistant backport -automerge
+        env:
+          BACKPORT_LABEL_REGEXP: "backport/(?P<target>website)"
+          BACKPORT_TARGET_TEMPLATE: "stable-{{.target}}"
+          GITHUB_TOKEN: ${{ secrets.HASHIBOT_TOKEN }}