Update build.yml

Author: bubuntux

.github/workflows/build.yml

@@ -32,11 +32,3 @@ jobs:
           cosign_private_key: ${{ secrets.SIGNING_SECRET }}
           registry_token: ${{ github.token }}
           pr_event_number: ${{ github.event.number }}
-  keepalive-job:
-    name: Keepalive Workflow
-    runs-on: ubuntu-latest
-    permissions:
-      actions: write
-    steps:
-      - uses: actions/checkout@v4
-      - uses: gautamkrishnar/keepalive-workflow@v2