[core] Fix docs GitHub API rate limit (mui#34856)

Author: oliviertassinari

docs/next.config.js

@@ -150,7 +150,9 @@ module.exports = withDocsInfra({
     };
   },
   env: {
-    GITHUB_AUTH: process.env.GITHUB_AUTH,
+    GITHUB_AUTH: process.env.GITHUB_AUTH
+      ? `Basic ${Buffer.from(process.env.GITHUB_AUTH).toString('base64')}`
+      : null,
     LIB_VERSION: pkg.version,
     FEEDBACK_URL: process.env.FEEDBACK_URL,
     SLACK_FEEDBACKS_TOKEN: process.env.SLACK_FEEDBACKS_TOKEN,

docs/pages/versions.js

@@ -22,13 +22,10 @@ function formatVersion(version) {
 }
 
 async function getBranches() {
-  // TODO: find an appropriate way to prevent "API rate limit exceeded"
-  // const githubAuthorizationToken = process.env.GITHUB_AUTH || '';
-
   const result = await fetch('https://api.github.com/repos/mui/material-ui-docs/branches', {
-    // headers: {
-    //   Authorization: `Basic ${Buffer.from(githubAuthorizationToken).toString('base64')}`,
-    // },
+    headers: {
+      Authorization: process.env.GITHUB_AUTH,
+    },
   });
   const text = await result.text();