ci: add reactions to /update-vrt comment

.github/workflows/update-vrt.yml

@@ -4,11 +4,11 @@ on:
     types: [ created ]
 
 permissions:
-  pull-requests: write
-  contents: write
+  pull-requests: read
+  contents: read
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.event.issue.number }}
+  group: ${{ github.workflow }}-${{ github.event.issue.number }}-${{ contains(github.event.comment.body, '/update-vrt') }}
   cancel-in-progress: true
 
 jobs:
@@ -48,3 +48,32 @@ jobs:
           fi
           git commit -m "Update VRT"
           git push origin HEAD:${{ steps.comment-branch.outputs.head_ref }}
+  add-starting-reaction:
+    runs-on: ubuntu-latest
+    if: |
+      github.event.issue.pull_request &&
+      contains(github.event.comment.body, '/update-vrt')
+    permissions:
+      contents: write
+    steps:
+      - name: React to comment
+        uses: dkershner6/reaction-action@v2
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          commentId: ${{ github.event.comment.id }}
+          reaction: "+1"
+  add-finished-reaction:
+    runs-on: ubuntu-latest
+    needs: update-vrt
+    if: |
+      github.event.issue.pull_request &&
+      contains(github.event.comment.body, '/update-vrt')
+    permissions:
+      contents: write
+    steps:
+      - name: React to comment
+        uses: dkershner6/reaction-action@v2
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          commentId: ${{ github.event.comment.id }}
+          reaction: "rocket"