Add attestations permission to workflow

Grants the workflow 'attestations: write' permission, likely to enable the creation or management of attestations during the job execution.

.github/workflows/image.yml

@@ -44,6 +44,7 @@ jobs:
       contents: read
       packages: write
       id-token: write
+      attestations: write
 
     steps:
       - name: Checkout repository