offboard-spoke.sh: run as root, remove sudo from python3 install

spoke/Dockerfile

@@ -1,10 +1,6 @@
 FROM debian:bookworm-slim
 RUN apt-get update && apt-get install -y autossh openssh-client && rm -rf /var/lib/apt/lists/*
 
-RUN echo "PermitRootLogin no" >> /etc/ssh/sshd_config
-RUN echo "PasswordAuthentication no" >> /etc/ssh/sshd_config
-RUN echo "Subsystem sftp internal-sftp" >> /etc/ssh/sshd_config
-
 ARG UID=1000
 ARG GID=1000
 RUN groupadd -g ${GID} armbian && useradd -m -u ${UID} -g armbian armbian