Check if needing to run

Author: wence-

.github/workflows/cron.yaml

@@ -34,10 +34,20 @@ jobs:
       run: |
         echo "last_run_id=$((${{ github.run_id }} - 1))" >> $GITHUB_OUTPUT
     - name: Download last run commit hashes
+      continue-on-error: true
       uses: actions/download-artifact@v4
       with:
         name: commit-hashes.txt
         path: previous-run-hashes.txt
         github-token: ${{ secrets.GITHUB_TOKEN }}
         # Previous run
         run-id: ${{ job.get_last_id.last_run_id }}
+    - name: Check if run needed
+      run: |
+        if [ ! -f previous-run-hashes.txt ]; then
+          echo "No previous run hashes, need to re-run"
+        elif cmp -s commit-hashes.txt previous-run-hashes.txt; then
+          echo "Previous run hash same as this one, no need to re-run"
+        else
+          echo "Previous run hash different, need to re-run"
+        fi