add workflows for triaging issues and PRs

.github/labeler.yaml

@@ -0,0 +1,20 @@
+github-actions:
+  - changed-files:
+      - any-glob-to-any-file:
+        - '.github/**'
+
+documentation:
+  - changed-files:
+      - any-glob-to-any-file:
+        - 'README.md'
+        - '**/*.md'
+
+legal:
+  - changed-files:
+      - any-glob-to-any-file:
+        - 'LICENSE'
+
+examples:
+  - changed-files:
+      - any-glob-to-any-file:
+        - 'example/**'

.github/workflows/triage-ci.yaml

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+name: "Triage PRs"
+on:
+- pull_request_target
+
+jobs:
+  triage:
+    permissions:
+      contents: read
+      pull-requests: write
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/labeler@v5
+      with:
+        configuration-path: .github/labeler.yaml

.github/workflows/triage.yaml

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+name: Label issues
+on:
+  issues:
+    types:
+      - reopened
+      - opened
+jobs:
+  label_issues:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+    steps:
+      - run: gh issue edit "$NUMBER" --add-label "$LABELS"
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GH_REPO: ${{ github.repository }}
+          NUMBER: ${{ github.event.issue.number }}
+          LABELS: needs-triage