add vouch system requirement for PRs > 50 line changes

.github/workflows/vouch-manage-by-discussion.yml

@@ -0,0 +1,33 @@
+name: Vouch (manage by discussion)
+
+# Same commands as vouch-manage-by-issue.yml, but for discussion comments.
+
+on:
+  discussion_comment:
+    types: [created]
+
+concurrency:
+  group: vouch-manage
+  cancel-in-progress: false
+
+permissions:
+  contents: write
+  discussions: write
+
+jobs:
+  manage:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+
+    steps:
+      - name: "Checkout code"
+        uses: actions/checkout@v7
+
+      - name: "Apply vouch command"
+        uses: mitchellh/vouch/action/manage-by-discussion@v1.5.0
+        with:
+          discussion-number: ${{ github.event.discussion.number }}
+          comment-node-id: ${{ github.event.comment.node_id }}
+          roles: admin,maintain,write
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}