Create CET-6 90-day check-in site

scripts/execution-profile.mjs

@@ -0,0 +1,16 @@
+import { readFileSync } from "node:fs";
+
+export function readExecutionProfile() {
+  let settings;
+  try {
+    settings = JSON.parse(readFileSync(new URL("../.sites-runtime/execution-profile.json", import.meta.url), "utf8"));
+  } catch (error) {
+    // Clean clones and remote builds have no checkout-local selection.
+    if (error.code === "ENOENT") return "portable";
+    throw error;
+  }
+  if (!["managed-linux", "portable"].includes(settings?.executionProfile)) {
+    throw new Error("Invalid local execution profile; rerun the Sites plugin's configure-execution-profile.mjs.");
+  }
+  return settings.executionProfile;
+}