Add attestations permission to Docker workflow

Grants the 'attestations: write' permission in the GitHub Actions Docker workflow to enable writing attestations. This may be required for enhanced security or provenance features.

.github/workflows/docker.yml

@@ -23,6 +23,7 @@ jobs:
       contents: read
       packages: write
       id-token: write
+      attestations: write
 
     steps:
       - name: Checkout repository