GHA: Linux builder: log out from ghcr.io

It does not seem to be able to reuse the credentials
from the keychain in another GHA workflow, so better
to always log in again.

If this does not work we can also log in manually,
without their action.

[ci skip]

.github/workflows/linux-builder-containers.yaml

@@ -77,7 +77,6 @@ jobs:
         registry: ghcr.io
         username: ${{ github.repository_owner }}
         password: ${{ secrets.GITHUB_TOKEN }}
-        logout: false
 
     - name: Build
       run: |