Add .gitea/workflows/remind.yaml (#20)

Reviewed-on: #20

.gitea/workflows/remind.yaml

@@ -0,0 +1,18 @@
+name: 'check reminders'
+
+on:
+  push:
+  schedule:
+    - cron: '*/20 * * * *'
+
+permissions:
+  issues: write
+  pull-requests: write
+
+jobs:
+  reminder:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: check reminders and notify
+        uses: agrc/reminder-action@v1