fix error

.github/workflows/vib-build.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Check if there was an update to the base image
         if: github.event_name != 'schedule'
         run: |
-          wget https://github.com/${{ github.repository }}/releases/download/${{ env.DIGEST_RELEASE_TAG }}a/digest.txt
+          wget https://github.com/${{ github.repository }}/releases/download/${{ env.DIGEST_RELEASE_TAG }}a/digest.txt || true
           touch digest.txt
           mv digest.txt last_digest.txt
           curl https://differ.vanillaos.org/images/desktop > vanilla-image-info