build: add triage opened issue workflow

Author: ndr-brt

.github/workflows/triage-issue.yml

@@ -0,0 +1,20 @@
+name: triage opened issue
+
+on:
+  issues:
+    types:
+      - reopened
+      - opened
+
+jobs:
+  label-issue:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+    steps:
+      - run: gh issue edit "$NUMBER" --add-label "$LABELS"
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GH_REPO: ${{ github.repository }}
+          NUMBER: ${{ github.event.issue.number }}
+          LABELS: triage