feat(frontend): Preserve openapi.json spec file on generation failure (#10791)

`openapi.json` file is cleared when script fails to retrieve api spec
from the server. This shouldn't happen and it breaks building docker
containers.

### Changes 🏗️

Use temp file during generation to prevent actual file clearing on
failure.

### Checklist 📋

#### For code changes:
- [x] I have clearly listed my changes in the PR description
- [x] I have made a test plan
- [x] I have tested my changes according to the test plan:
  - [x] Spec file doesn't get cleared on failure
  - [x] Spec file is correctly generated
  - [x] Works when frontend is run in docker container

autogpt_platform/frontend/scripts/generate-api-queries.ts

@@ -4,6 +4,7 @@ import { getAgptServerBaseUrl } from "@/lib/env-config";
 import { execSync } from "child_process";
 import * as path from "path";
 import * as fs from "fs";
+import * as os from "os";
 
 function fetchOpenApiSpec(): void {
   const args = process.argv.slice(2);
@@ -42,15 +43,30 @@ function fetchOpenApiSpec(): void {
 
   console.log(`Fetching OpenAPI spec from: ${openApiUrl}`);
 
+  // Write to a temporary file first to avoid clearing the real file on failure
+  const tmpOutputPath = path.join(
+    os.tmpdir(),
+    `openapi-fetch-${Date.now()}.json`,
+  );
+
   try {
-    // Fetch the OpenAPI spec
-    execSync(`curl "${openApiUrl}" > "${outputPath}"`, { stdio: "inherit" });
+    // Fetch the OpenAPI spec to a temp file
+    execSync(`curl "${openApiUrl}" -o "${tmpOutputPath}"`, {
+      stdio: "inherit",
+    });
 
     // Format with prettier
-    execSync(`prettier --write "${outputPath}"`, { stdio: "inherit" });
+    execSync(`prettier --write "${tmpOutputPath}"`, { stdio: "inherit" });
+
+    // Move temp file to final output path
+    fs.copyFileSync(tmpOutputPath, outputPath);
+    fs.unlinkSync(tmpOutputPath);
 
     console.log("✅ OpenAPI spec fetched and formatted successfully");
   } catch (error) {
+    if (fs.existsSync(tmpOutputPath)) {
+      fs.unlinkSync(tmpOutputPath);
+    }
     console.error("❌ Failed to fetch OpenAPI spec:", error);
     process.exit(1);
   }