buildx failed with: ERROR: failed to solve: process "/bin/sh -c cd /tmp && git clone -q ${RUNNERREPO} && cd runner && git checkout v${VERSION} -b build && sed -i'' -e /version/s/6......\\\"$/${SDK}.0.100\\\"/ src/global.json && git apply /tmp/runner.patch && cd src && ./dev.sh layout && ./dev.sh package && ./dev.sh test && rm -rf /root/.dotnet /root/.nuget && sudo -u runner tar -C ${HOMEDIR} -xzf /tmp/runner/_package/actions-runner-linux-s390x-${VERSION}.tar.gz && rm -rf /tmp/runner" did not complete successfully: exit code: 1

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/