Replace startup.sh with supervisord for process management in OS runtimes

[Copilot]

Implements supervisord to manage background processes (sshd, etc.) instead of the previous startup.sh + sleep infinity approach.

Changes

All OS runtimes (ubuntu/24.04, debian/12.6, ubuntu-cuda/24.04):

• Added supervisord.conf configuring:

  • sshd as a managed daemon with auto-restart
  • setup script for one-time initialization (hostname, pod_id)
  • RPC interface for supervisorctl management

• Updated Dockerfiles:

  • Install supervisor package
  • CMD changed from startup.sh to /usr/bin/supervisord
  • Ensure root user context for supervisord

• Created setup.sh extracting one-time tasks from original startup.sh

Configuration

[program:sshd]
command=/usr/sbin/sshd -D
autostart=true
autorestart=true

[program:setup]
command=/usr/start/setup.sh
autorestart=false
startsecs=0
priority=0

Enables runtime process monitoring via supervisorctl status and easy addition of new managed processes.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• developer.download.nvidia.com
  • Triggering command: /usr/lib/apt/methods/https (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

尝试使用supervisord作为runtime启动命令，启动sshd等其他后台进程

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