adding github token

try github token directly

Author: Patrick Thornton

.github/workflows/preview_sdks.yml

@@ -27,6 +27,7 @@ jobs:
       - name: Compile
         env:
           FERN_TOKEN: ${{ secrets.FERN_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           cd fern/.preview/fern-typescript-node-sdk
           yarn install