Scaffold update-ghes-versions.ts script

pr-checks/update-ghes-versions.ts

@@ -0,0 +1,14 @@
+#!/usr/bin/env npx tsx
+
+/**
+ * Updates src/api-compatibility.json with the current range of supported
+ * GitHub Enterprise Server versions by reading the releases.json file from
+ * an `enterprise-releases` checkout.
+ */
+
+function main() {}
+
+// Only call `main` if this script was run directly.
+if (require.main === module) {
+  main();
+}