skills/runpod/golden-paths/22-minimal-pod-image/template/start.sh

#!/usr/bin/env bash
# Minimal pod startup that reproduces what runpod/pytorch's /start.sh does for SSH,
# then runs the workload. On an official runpod/* base you would NOT need this — you'd
# inherit /start.sh. This is the "from a non-Runpod base" pattern: without it, a pod
# built on a plain base image has no SSH and you can be locked out.
set -e

# 1. SSH: install the injected public key, generate host keys, start sshd.
mkdir -p ~/.ssh && chmod 700 ~/.ssh
if [ -n "$PUBLIC_KEY" ]; then
  echo "$PUBLIC_KEY" >> ~/.ssh/authorized_keys
  chmod 600 ~/.ssh/authorized_keys
fi
ssh-keygen -A
service ssh start

# 2. Workload: a tiny HTTP server so the pod stays up and the proxy URL is testable.
echo "pod up: sshd started, serving http on :${PORT:-8000}"
exec python3 -u -m http.server "${PORT:-8000}"