Automate backports via a dispatch workflow

Closes #27449

Signed-off-by: Alexander Schwartz <aschwart@redhat.com>

.github/workflows/backport-dispatch.yaml

@@ -0,0 +1,34 @@
+name: Automated Backporting via Dispatch
+
+on:
+  workflow_dispatch:
+    inputs:
+      targetBranch:
+        description: 'Release (22.0, 24.0, ...)'
+        required: true
+        type: string
+        default: "24.0"
+      pullRequest:
+        description: 'Pull request (just the ID)'
+        required: true
+        type: string
+      dryRun:
+        description: 'Dry run'
+        required: false
+        default: false
+        type: boolean
+
+jobs:
+  backporting:
+    name: "Backporting"
+    runs-on: ubuntu-latest
+    steps:
+      - name: Backporting
+        uses: kiegroup/git-backporting@bce5dd4f9969d47da9cbb6ed06abbf87216afc98 # 4.5.1
+        with:
+          target-branch: release/${{ inputs.targetBranch }}
+          pull-request: https://github.com/${{ github.repository }}/pulls/${{ inputs.pullRequest }}
+          auth: ${{ secrets.GITHUB_TOKEN }}
+          dry-run: ${{ inputs.dryRun }}
+          bp-branch-name: backport/${{ inputs.targetBranch }}/pr-${{ inputs.pullRequest }}
+          no-squash: true

.github/workflows/backport-reaper.yaml

@@ -0,0 +1,22 @@
+name: Backport branch reaper
+
+on:
+  pull_request_target:
+    types:
+      - closed
+    branches:
+      - 'release/*.*'
+
+jobs:
+  remove_backport_branch:
+    if: startsWith(github.event.pull_request.head.ref, 'backport/') && github.event.pull_request.head.repo.full_name == github.event.pull_request.base.repo.full_name
+    runs-on: ubuntu-latest
+    steps:
+      - name: Delete PR head branches
+        # language=bash
+        run: |
+          # safety switch that we only remove backport branches
+          BP=$(echo ${{ github.event.pull_request.head.ref }} | sed 's|backport/||' ) 
+          gh api --method DELETE /repos/${{ github.event.pull_request.base.repo.full_name }}/git/refs/heads/backport/${BP}
+        env:
+          GH_TOKEN: ${{ github.token }}

.github/workflows/ci.yml

@@ -5,6 +5,7 @@ on:
     branches-ignore:
       - main
       - dependabot/**
+      - backport/**
   pull_request:
   workflow_dispatch:
 

.github/workflows/codeql-analysis.yml

@@ -5,6 +5,7 @@ on:
     branches-ignore:
       - main
       - dependabot/**
+      - backport/**
       - quarkus-next
   pull_request:
      branches: [main]

.github/workflows/documentation.yml

@@ -5,6 +5,7 @@ on:
     branches-ignore:
       - main
       - dependabot/**
+      - backport/**
       - quarkus-next
   pull_request:
   workflow_dispatch:

.github/workflows/guides.yml

@@ -5,6 +5,7 @@ on:
     branches-ignore:
       - main
       - dependabot/**
+      - backport/**
       - quarkus-next
   pull_request:
   workflow_dispatch:

.github/workflows/js-ci.yml

@@ -5,6 +5,7 @@ on:
     branches-ignore:
       - main
       - dependabot/**
+      - backport/**
       - quarkus-next
   pull_request:
   workflow_dispatch:

.github/workflows/operator-ci.yml

@@ -5,6 +5,7 @@ on:
     branches-ignore:
       - main
       - dependabot/**
+      - backport/**
   pull_request:
   workflow_dispatch: