Sync theme (#54)

* add dependabot

* keep sync_theme alive

.github/dependabot.yml

@@ -0,0 +1,15 @@
+# See https://docs.github.com/en/code-security/supply-chain-security/keeping-your-dependencies-updated-automatically/keeping-your-actions-up-to-date-with-dependabot
+
+version: 2
+updates:
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    labels:
+      - "Bot"
+    groups:
+      github-actions:
+        patterns:
+          - '*'

.github/workflows/sync_theme.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
     - name: Checkout repo
-      uses: actions/checkout@v3
+      uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b # v4
 
     - name: submodule checkout
       run: |
@@ -38,3 +38,13 @@ jobs:
            timestamp=$(date -u)
            git commit -m "Update theme on: ${timestamp}" || exit 0
            git push
+
+  keepalive-job:
+    name: Keepalive Workflow
+    runs-on: ubuntu-latest
+    if: github.event_name == 'schedule'
+    permissions:
+      actions: write
+    steps:
+      - uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b # v4
+      - uses: gautamkrishnar/keepalive-workflow@beb86212524e1ae856d1cd80efb44e73bf7daf4a # 2.0.1