cd: optimize nightly

Add check to only run nightly if changes in the past 24 hours

.github/workflows/on-issue.yml

@@ -0,0 +1,20 @@
+name: on-issue
+
+on:
+  issues:
+    types: [ opened, closed, reopened ]
+
+
+jobs:
+
+  on-issue:
+    name: On new issue
+    runs-on: ubuntu-latest
+    steps:
+      - name: Send Telegram Message
+        run: |
+          msg_text='${{ github.actor }} updated an issue:
+            status: ${{ github.event.issue.state }} - #${{ github.event.issue.number }} ${{ github.event.issue.title }}
+            https://github.com/zaneschepke/wgtunnel/issues/${{ github.event.issue.number }}'
+          curl -s -X POST 'https://api.telegram.org/bot${{ secrets.TELEGRAM_TOKEN }}/sendMessage' \
+          -d "chat_id=${{ secrets.TELEGRAM_TO }}&text=${msg_text}&message_thread_id=${{ secrets.TELEGRAM_TOPIC }}"