sudo apt update && sudo apt install -y python3-venv python3-pip nginx
sudo useradd -m -s /bin/bash app && sudo mkdir -p /opt/app && sudo chown -R app:app /opt/app
sudo -u app bash -lc 'cd /opt/app && python3 -m venv venv && ./venv/bin/pip install -U pip uvicorn fastapi'

sudo tee /etc/systemd/system/app.service >/dev/null <<'EOF'
[Unit]
After=network.target

[Service]
User=app
WorkingDirectory=/opt/app
ExecStart=/opt/app/venv/bin/uvicorn main:app --host 0.0.0.0 --port 8000
Restart=always

[Install]
WantedBy=multi-user.target
EOF

sudo systemctl daemon-reload
sudo systemctl enable --now app
sudo systemctl status app --no-pager