ci: Add empty commit step to workflow

Add step to commit empty changes to keep workflow active.

Author: yunnysunny

.github/workflows/debian.yml

@@ -29,6 +29,12 @@ jobs:
         run: |
           MATRIX_JSON=$(node ./scripts/get_all_versions.mjs)
           echo "matrix=$MATRIX_JSON" >> $GITHUB_OUTPUT 
+      - name: Commit empty changes
+        run: |
+          git config --local user.email "action@github.com"
+          git config --local user.name "GitHub Action"
+          git commit --allow-empty -m "Keep workflow active on $(date +'%Y-%m-%d %H:%M')"
+          git push
   docker:
     runs-on: ubuntu-latest
     needs: generate-matrix
@@ -239,4 +245,4 @@ jobs:
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
-          repository: yunnysunny/easy-monitor
+          repository: yunnysunny/easy-monitor