Add backport and auto delete workflow (#339)

Signed-off-by: Annie Lee <leeyun@amazon.com>

.github/workflows/backport.yml

@@ -0,0 +1,29 @@
+
+name: Backport
+on:
+  pull_request_target:
+    types:
+      - closed
+      - labeled
+
+jobs:
+  backport:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+    name: Backport
+    steps:
+      - name: GitHub App token
+        id: github_app_token
+        uses: tibdex/github-app-token@v1.5.0
+        with:
+          app_id: ${{ secrets.APP_ID }}
+          private_key: ${{ secrets.APP_PRIVATE_KEY }}
+          installation_id: 22958780
+
+      - name: Backport
+        uses: VachaShah/backport@v1.1.4
+        with:
+          github_token: ${{ steps.github_app_token.outputs.token }}
+          branch_name: backport/backport-${{ github.event.number }}

.github/workflows/delete_backport_branch.yml

@@ -0,0 +1,15 @@
+name: Delete merged branch of the backport PRs
+on:
+  pull_request:
+    types:
+      - closed
+
+jobs:
+  delete-branch:
+    runs-on: ubuntu-latest
+    if: startsWith(github.event.pull_request.head.ref,'backport/')
+    steps:
+      - name: Delete merged branch
+        uses: SvanBoxel/delete-merged-branch@main
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

DEVELOPER_GUIDE.md

@@ -105,4 +105,9 @@ You can do this by running `./gradlew :alerting:run -PnumNodes=<numberOfNodesYou
 You can also run the integration tests against a multi-node cluster by running `./gradlew :alerting:integTest -PnumNodes=<numberOfNodesYouWant>`
 
 You can also debug a multi-node cluster, by using a combination of above multi-node and debug steps.
-But, you must set up debugger configurations to listen on each port starting from `5005` and increasing by 1 for each node.  
+But, you must set up debugger configurations to listen on each port starting from `5005` and increasing by 1 for each node.
+
+### Backport
+
+- [Link to backport documentation](https://github.com/opensearch-project/opensearch-plugins/blob/main/BACKPORT.md)
+