add keepalive workflow

.github/workflows/keepalive.yaml

@@ -0,0 +1,15 @@
+name: Github Action with a cronjob trigger
+on:
+  schedule:
+    - cron: '0 0 * * *'
+
+jobs:
+  cronjob-based-github-action:
+    name: Cronjob based github action
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      -  # step1
+      -  # step 2
+      -  # step n, use it as the last step
+      - uses: gautamkrishnar/keepalive-workflow@master # using the workflow with default settings