feat(docker): guide clone installation and validate paired update artifacts

scripts/docker-start.import.test.mjs

@@ -0,0 +1,13 @@
+import assert from "node:assert/strict";
+import { spawnSync } from "node:child_process";
+
+const result = spawnSync(
+	process.execPath,
+	[
+		"--input-type=module",
+		"-e",
+		"import {validateRuntime} from './scripts/docker-start.mjs';try{validateRuntime({});process.exit(1)}catch(error){if(!error.message.startsWith('Invalid runtime configuration'))throw error}",
+	],
+	{ encoding: "utf8" },
+);
+assert.equal(result.status, 0, result.stderr);