feat(map): add cache-first Cesium gateway and AMD egress

services/map-gateway/runtime-entrypoint.mjs

@@ -0,0 +1,17 @@
+import { spawn } from "node:child_process";
+import { mkdir, chown } from "node:fs/promises";
+
+const cacheDir = String(process.env.MAP_CACHE_DIR || "").trim();
+if (cacheDir) {
+  await mkdir(cacheDir, { recursive: true });
+  await chown(cacheDir, 1000, 1000);
+}
+if (process.getuid?.() === 0) {
+  process.setgid(1000);
+  process.setuid(1000);
+}
+const [command, ...args] = process.argv.slice(2);
+if (!command) throw new Error("map_gateway_runtime_command_required");
+const child = spawn(command, args, { stdio: "inherit" });
+child.on("exit", (code, signal) => process.exitCode = code ?? (signal ? 1 : 0));
+child.on("error", (error) => { throw error; });