fix(ci): remove invalid environments permission from preview workflow (#70)

GitHub Actions workflow permissions only allow a fixed set of keys;
'environments' is not valid and caused workflow validation to fail on push.

Co-authored-by: Cursor Agent <cursoragent@cursor.com>

Author: kentcdodds

.github/workflows/preview.yml

@@ -40,7 +40,6 @@ on:
 permissions:
   contents: read
   pull-requests: write
-  environments: write
 
 concurrency:
   group: >-