chore: Add missing container publish privileges (#162)

Author: gtema

.github/workflows/build-keycloak-image.yml

@@ -11,6 +11,9 @@ on:
 jobs:
   build_and_push:
     runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      id-token: write
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4