TCLOUD-4780: Use crypto to make the temporary file name unpredictable

Note that this doesn't prevent the file being rewriten after it has been
created but as we have to pass the file to other processes that can't be
prevented.

Author: tiny-james

.github/workflows/scripts/generate_redirects.mjs

@@ -1,4 +1,6 @@
+import crypto from 'node:crypto';
 import fs from 'node:fs';
+import os from 'node:os';
 import path from 'node:path';
 import { spawn } from 'node:child_process';
 
@@ -166,7 +168,7 @@ function* generateRedirectObjectsAsync(dryRun, bucket, prefix, redirectsByLocati
 </html>`;
 
   // Write temporary file
-  const newFileTemplate = `/tmp/redirect-${Date.now()}.html`;
+  const newFileTemplate = path.join(os.tmpdir(), `redirect-${crypto.randomBytes(16).toString('hex')}.html`);
   fs.writeFileSync(newFileTemplate, htmlContent);
 
   let allSettled = Promise.resolve();