buildx failed with: ERROR: failed to build: failed to solve: process "/bin/sh -c set -x && groupadd --system --gid 101 nginx && useradd --system --gid nginx --no-create-home --home-dir /nonexistent --uid 101 nginx && apt-get update && apt-get install --no-install-recommends --no-install-suggests -y ca-certificates gpg lsb-release git wget make && nginxPackages=\" nginx-plus \" && echo \"Acquire::https::pkgs.nginx.com::Verify-Peer \\\"true\\\";\" > /etc/apt/apt.conf.d/90nginx && echo \"Acquire::https::pkgs.nginx.com::Verify-Host \\\"true\\\";\" >> /etc/apt/apt.conf.d/90nginx && echo \"Acquire::https::pkgs.nginx.com::SslCert \\\"/etc/ssl/nginx/nginx-repo.crt\\\";\" >> /etc/apt/apt.conf.d/90nginx && echo \"Acquire::https::pkgs.nginx.com::SslKey \\\"/etc/ssl/nginx/nginx-repo.key\\\";\" >> /etc/apt/apt.conf.d/90nginx && printf \"deb [signed-by=/usr/share/keyrings/nginx-archive-keyring.gpg] https://pkgs.nginx.com/plus/${PLUS_VERSION}/ubuntu/ `lsb_release -cs` nginx-plus\\n\" > /etc/apt/sources.list.d/nginx-plus.list && wget -qO - https://cs.nginx.com/static/keys/nginx_signing.key | gpg --dearmor | tee /usr/share/keyrings/nginx-archive-keyring.gpg >/dev/null && mkdir -p /etc/ssl/nginx && cat nginx-repo.crt > /etc/ssl/nginx/nginx-repo.crt && cat nginx-repo.key > /etc/ssl/nginx/nginx-repo.key && apt-get update && apt-get install --no-install-recommends --no-install-suggests -y $nginxPackages curl gettext-base jq gnupg2 && apt-get remove --purge -y lsb-release && apt-get remove --purge --auto-remove -y && rm -rf /var/lib/apt/lists/* /etc/apt/sources.list.d/nginx-plus.list && rm -rf /etc/apt/apt.conf.d/90nginx /etc/ssl/nginx" did not complete successfully: exit code: 1

nginx-key= is not a valid secret