fix(docs): fetch commit history from the repository Vercel names, since its clone has no origin remote

Author: waleedlatif1

apps/docs/scripts/fetch-git-history.ts

@@ -3,6 +3,8 @@
  * shallow clone (every file untouched since the boundary commit would get that commit's date), so
  * the docs sitemap shipped with no `lastModified` at all. Fetch the commit history before the
  * build. `--filter=blob:none` skips file contents: `git log --name-only` needs commits and trees.
+ * Vercel's clone has no `origin` remote, so the history comes from the public repository URL its
+ * system environment names, pinned to the commit being built.
  *
  * A failed fetch leaves the clone shallow, so pages ship undated as before. That is logged rather
  * than failing the deploy, because dates are an enhancement and the docs must still ship.
@@ -25,10 +27,37 @@ function git(args: string[], timeout?: number): string {
   }).trim()
 }
 
-if (process.env.VERCEL) {
+const {
+  VERCEL,
+  VERCEL_GIT_PROVIDER,
+  VERCEL_GIT_REPO_OWNER,
+  VERCEL_GIT_REPO_SLUG,
+  VERCEL_GIT_COMMIT_SHA,
+} = process.env
+
+if (VERCEL) {
   try {
     if (git(['rev-parse', '--is-shallow-repository']) === 'true') {
-      git(['fetch', '--unshallow', '--filter=blob:none', '--no-tags', 'origin'], FETCH_TIMEOUT_MS)
+      if (
+        VERCEL_GIT_PROVIDER !== 'github' ||
+        !VERCEL_GIT_REPO_OWNER ||
+        !VERCEL_GIT_REPO_SLUG ||
+        !VERCEL_GIT_COMMIT_SHA
+      ) {
+        throw new Error('Vercel did not provide the GitHub repository and commit for this build')
+      }
+      const repositoryUrl = `https://github.com/${VERCEL_GIT_REPO_OWNER}/${VERCEL_GIT_REPO_SLUG}.git`
+      git(
+        [
+          'fetch',
+          '--unshallow',
+          '--filter=blob:none',
+          '--no-tags',
+          repositoryUrl,
+          VERCEL_GIT_COMMIT_SHA,
+        ],
+        FETCH_TIMEOUT_MS
+      )
       logger.info('Fetched full commit history for docs last-modified dates')
     } else {
       logger.info('Clone already has full commit history')