meta: add next-env.d.ts to .gitignore (nodejs#8819)

* Add next-env.d.ts to .gitignore

* Ensure next-env.d.ts is generated for type-checking

Author: MattIPv4

.gitignore

@@ -12,6 +12,7 @@ package-lock.json
 apps/site/.next
 apps/site/build
 apps/site/public/blog-data.json
+apps/site/next-env.d.ts
 
 # Test Runner
 junit.xml

apps/site/next-env.d.ts

@@ -21,7 +21,7 @@
     "lint:js:fix": "node --run lint:js -- --fix",
     "lint:md": "eslint \"**/*.md?(x)\" --cache --cache-strategy=content --cache-location=.eslintmdcache",
     "lint:md:fix": "node --run lint:md -- --fix",
-    "lint:types": "tsc --noEmit",
+    "lint:types": "next typegen && tsc --noEmit",
     "playwright": "playwright test",
     "scripts:release-post": "cross-env NODE_NO_WARNINGS=1 node scripts/release-post/index.mjs",
     "serve": "node --run dev",