added a github action for raising PRs with automatic cherry-pick

(cherry picked from commit f4f5af7)

Author: rsill-neo4j

.backportrc.json

@@ -0,0 +1,5 @@
+{
+    "repoOwner": "Neo4j",
+    "repoName": "docs-graphql",
+    "prTitle": "[GRAFT][{{targetBranch}}] {{commitMessages}}"
+  }

.github/workflows/auto-backport.yml

@@ -0,0 +1,31 @@
+name: auto-cherry-pick
+on:
+  pull_request_target:
+    types: ["labeled", "closed"]
+
+jobs:
+  backport:
+    name: Cherry-pick PR
+    runs-on: [ubuntu-latest]
+    if: |
+      github.event.pull_request.merged == true
+      && contains(github.event.pull_request.labels.*.name, 'auto-cherry-pick')
+      && (
+        (github.event.action == 'labeled' && github.event.label.name == 'auto-cherry-pick')
+        || (github.event.action == 'closed')
+      )
+    steps:
+      - name: Cherry-pick action
+        uses: sorenlouv/backport-github-action@929f69d04adbc196d982e60f02837b6cc00b3129
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          auto_backport_label_prefix: auto-cherry-pick-to-
+          add_original_reviewers: true
+
+      - name: Info log
+        if: ${{ success() }}
+        run: cat ~/.backport/backport.info.log
+
+      - name: Debug log
+        if: ${{ failure() }}
+        run: cat ~/.backport/backport.debug.log