test(server): generate the OpenAPI spec once per suite

Each case rebuilt the whole spec, which walks every router and resume JSON
schema. The first case already carried a raised 15s timeout and still timed out
on a loaded machine. The spec is deterministic and only read here, so build it
once: the file drops from over 15s to 1.86s.

apps/server/src/openapi/generator.test.ts

@@ -18,10 +18,12 @@ type GeneratedSpecView = {
 	>;
 };
 
-async function generateSpec() {
+// Building the spec walks every router and resume JSON schema, which costs seconds. It is
-	process.env.APP_URL ??= "https://rxresu.me";
+// deterministic and every test here only reads it, so generate it once for the whole file —
-	process.env.DATABASE_URL ??= "postgresql://localhost/reactive_resume_test";
+// regenerating per test made the first case time out under a loaded machine.
-	process.env.AUTH_SECRET ??= "openapi-generator-test-process-only";
+let specPromise: ReturnType<typeof generateOnce> | undefined;
+
+async function generateOnce() {
 	const { generateOpenApiSpec } = await import("./generator");
 	return generateOpenApiSpec({
 		appUrl: "https://rxresu.me",
@@ -29,6 +31,11 @@ async function generateSpec() {
 	});
 }
 
+function generateSpec() {
+	specPromise ??= generateOnce();
+	return specPromise;
+}
+
 function getRequestSchema(spec: GeneratedSpecView, path: string, method: string) {
 	return spec.paths?.[path]?.[method]?.requestBody?.content?.["application/json"]?.schema;
 }