add no-response bot (fluttercommunity#340)

Author: Sebastian Roth

.github/workflows/no-response.yml

@@ -0,0 +1,18 @@
+name: No Response
+
+# Both `issue_comment` and `scheduled` event types are required for this Action
+# to work properly.
+on:
+  issue_comment:
+    types: [created]
+  schedule:
+    # Schedule for five minutes after the hour, every hour
+    - cron: '5 * * * *'
+
+jobs:
+  noResponse:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: lee-dohm/no-response@v0.5.0
+        with:
+          token: ${{ github.token }}

.gitignore

@@ -14,3 +14,4 @@ doc/api/*/
 .flutter-plugins-dependencies
 .fvm
 *.iml
+.dccache