feat(docker): prepare portable images with runtime hotel configuration

scripts/docker-start.mjs

@@ -0,0 +1,47 @@
+// Fail before listening if an installation has no valid runtime configuration.
+import { spawn } from "node:child_process";
+import { pathToFileURL } from "node:url";
+
+export function validateRuntime(settings) {
+	const invalid = [];
+	if (!settings.HOTEL_NAME?.trim() || settings.HOTEL_NAME === "Build fixture")
+		invalid.push("HOTEL_NAME");
+	if (
+		!settings.AUTH_SECRET ||
+		settings.AUTH_SECRET.length < 32 ||
+		settings.AUTH_SECRET.startsWith("build-fixture-")
+	)
+		invalid.push("AUTH_SECRET");
+	for (const [key, protocols] of [
+		["DATABASE_URL", ["mysql:"]],
+		["APP_URL", ["http:", "https:"]],
+	]) {
+		try {
+			if (!protocols.includes(new URL(settings[key]).protocol))
+				invalid.push(key);
+		} catch {
+			invalid.push(key);
+		}
+	}
+	if (invalid.length)
+		throw new Error(`Invalid runtime configuration: ${invalid.join(", ")}`);
+}
+
+if (import.meta.url === pathToFileURL(process.argv[1]).href) {
+	try {
+		validateRuntime(process.env);
+		const child = spawn(process.execPath, ["server.js"], { stdio: "inherit" });
+		for (const signal of ["SIGTERM", "SIGINT"])
+			process.on(signal, () => child.kill(signal));
+		child.on("error", () => {
+			console.error("CMS process could not start");
+			process.exitCode = 1;
+		});
+		child.on("exit", (code) => {
+			process.exitCode = code ?? 1;
+		});
+	} catch (error) {
+		console.error(error.message);
+		process.exitCode = 1;
+	}
+}