feat(deploy): automate Linux and macOS startup

Prepare the virtual environment, refresh changed dependencies and launch the configured server.

start-ose.sh

@@ -0,0 +1,28 @@
+#!/bin/sh
+set -eu
+cd "$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)"
+if ! command -v python3 >/dev/null 2>&1; then
+    echo 'Install Python 3.10 or newer, then run this script again.' >&2
+    exit 1
+fi
+if [ ! -x .venv/bin/python ]; then
+    echo 'Preparing the Python environment...'
+    if ! python3 -m venv .venv; then
+        echo 'Could not create .venv. Install Python venv support through your operating system, then try again.' >&2
+        exit 1
+    fi
+fi
+PYTHON=.venv/bin/python
+"$PYTHON" -c 'import sys; raise SystemExit(0 if sys.version_info >= (3,10) else "Python 3.10 or newer is required.")'
+FINGERPRINT=$("$PYTHON" -c 'from pathlib import Path; import hashlib; print(hashlib.sha256(Path("requirements.txt").read_bytes()).hexdigest())')
+PREVIOUS=$(cat .venv/ose-requirements.sha256 2>/dev/null || true)
+if [ "$FINGERPRINT" != "$PREVIOUS" ]; then
+    echo 'Installing the server dependencies. The first run may take a few minutes...'
+    "$PYTHON" -m pip install -r requirements.txt
+    printf '%s\n' "$FINGERPRINT" > .venv/ose-requirements.sha256
+fi
+if ! "$PYTHON" -c 'from server_config import load_config; raise SystemExit(0 if load_config()["setup_complete"] else 1)'; then
+    "$PYTHON" manage.py setup
+fi
+echo 'Starting OSE. Press Ctrl+C to stop it.'
+exec "$PYTHON" -u server.py "$@"