feat: Add platforms.json API

Author: dcramer

app/json-api/platforms.json/route.ts

@@ -0,0 +1,17 @@
+import {extractPlatforms, getDocsRootNode} from 'sentry-docs/docTree';
+
+export const GET = async (_request: Request) => {
+  const rootNode = await getDocsRootNode();
+  // this regex deals with names like .NET that would otherwise be sorted at the top
+  const leadingNonAlphaRegex = /^[^\w]/;
+  // sort the platforms alphabetically
+  const sortedPlatforms = extractPlatforms(rootNode).sort((a, b) =>
+    (a.title ?? a.name)
+      .replace(leadingNonAlphaRegex, '')
+      .localeCompare((b.title ?? b.name).replace(leadingNonAlphaRegex, ''))
+  );
+
+  return new Response(JSON.stringify(sortedPlatforms), {
+    headers: {'content-type': 'application/json'},
+  });
+};