ci: use github registry.

Author: Amirouche

.github/workflows/continuation-integration.yml

@@ -25,4 +25,4 @@ jobs:
       steps:
         - uses: actions/checkout@v2
         - name: check
-          run: docker run --volume $(pwd):/live --interactive --rm letloopxyz/schemers:latest bash -c 'cp /live/local/shell-subcommand.sh . && cd /live && SCHEME_LIVE_PREFIX=/ PATH=/opt/live/${{ matrix.implementation }}/bin:/live/local/bin:/usr/bin/:/bin USER=github scheme-live ${{ matrix.implementation }} check'
+          run: docker run --volume $(pwd):/live --interactive --rm ghcr.io/scheme-live/schemers:latest bash -c 'cp /live/local/shell-subcommand.sh . && cd /live && SCHEME_LIVE_PREFIX=/ PATH=/opt/live/${{ matrix.implementation }}/bin:/live/local/bin:/usr/bin/:/bin USER=github scheme-live ${{ matrix.implementation }} check'