Additional attestation fix

Signed-off-by: Geoff Wilson <geoff@gr-oss.io>

Author: suprjinx

.github/workflows/docker-build.yml

@@ -24,6 +24,7 @@ jobs:
       contents: read
       packages: write
       id-token: write
+      attestations: write
 
     steps:
       - name: Checkout code