github: drop quay secrets in build step

Publishing happens in a separate "manifest" step so we won't need quay
login credentials there.

Author: jelly

.github/workflows/build-ws-container.yml

@@ -20,7 +20,6 @@ jobs:
             runner: ubuntu-24.04-arm
 
     runs-on: ${{ matrix.build.runner }}
-    environment: quay.io
     permissions: {}
     timeout-minutes: 20
     outputs: