Fix Docker workflow permissions for ghcr.io push (#14)

Add attestations and id-token write permissions to resolve
'permission_denied: write_package' error.

Co-authored-by: Ona <no-reply@ona.com>

Author: Siddhant-K-code

.github/workflows/docker.yml

@@ -16,6 +16,8 @@ jobs:
     permissions:
       contents: read
       packages: write
+      attestations: write
+      id-token: write
 
     steps:
       - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1