add vouch manage by issue workflow

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

@@ -0,0 +1,31 @@
+on:
+  issue_comment:
+    types: [created]
+
+name: "Vouch - Manage by Issue"
+
+concurrency:
+  group: vouch-manage
+  cancel-in-progress: false
+
+permissions:
+  contents: write
+  issues: write
+  pull-requests: read
+
+jobs:
+  manage:
+    runs-on: namespace-profile-ghostty-xsm
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - uses: mitchellh/vouch/action/manage-by-issue@8c4f29bb7f2ddfa0b8dbc1bb6575e3f27c95d10a # v1.2.0
+        with:
+          repo: ${{ github.repository }}
+          issue-id: ${{ github.event.issue.number }}
+          comment-id: ${{ github.event.comment.id }}
+          vouch-keyword: "!vouch"
+          denounce-keyword: "!denounce"
+          unvouch-keyword: "!unvouch"
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}