Add auto labeler workflow (opensearch-project#205)

Signed-off-by: Tyler Ohlsen <ohltyler@amazon.com>

Author: ohltyler

.github/labeler.yml

@@ -0,0 +1,26 @@
+# Default all changes to backporting to 1.x branch
+backport 1.x:
+- '*'
+- '*/*'
+- '*/**/*'
+- '*/**/**/*'
+- '*/**/**/**/*'
+- '*/**/**/**/**/*'
+- '*/**/**/**/**/**/*'
+- '*/**/**/**/**/**/**/*'
+- '*/**/**/**/**/**/**/**/*'
+- '*/**/**/**/**/**/**/**/**/*'
+- '.github/**/*'
+
+# Adding "github actions" label to files in .github or its subdirectories
+github actions:
+- '.github/**/*'
+
+# Adding "documentation" label to markdown files or updating release notes
+documentation:
+- '*.md'
+- 'release-notes/*'
+
+# Adding a "dependencies" label when yarn.lock is updated
+dependencies:
+- 'yarn.lock'

.github/workflows/labeler.yml

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+name: "Pull Request Labeler"
+on:
+  pull_request_target:
+    branches:
+      - main
+    types:
+      - opened
+
+jobs:
+  label:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+    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: Label
+        uses: actions/labeler@v4
+        with:
+          repo-token: ${{ steps.github_app_token.outputs.token }}