add auto-backport functionality for reporting (opensearch-project#286)

Add auto-backport and auto-delete workflows for reporting

Signed-off-by: David Cui <davidcui@amazon.com>

.github/workflows/backport.yml

@@ -0,0 +1,28 @@
+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

@@ -44,3 +44,11 @@ Example output: `./build/reports-dashboards-0.0.1.zip`
 - `yarn test:jest`
 
   Runs the plugin tests.
+
+### Backports
+
+The Github workflow in [`backport.yml`](../.github/workflows/backport.yml) creates backport PRs automatically when the original PR
+with an appropriate label `backport <backport-branch-name>` is merged to main with the backport workflow run successfully on the
+PR. For example, if a PR on main needs to be backported to `1.x` branch, add a label `backport 1.x` to the PR and make sure the
+backport workflow runs on the PR along with other checks. Once this PR is merged to main, the workflow will create a backport PR
+to the `1.x` branch.