Fix CI for forks (#3226)

* Try with a different condition for forks

* Skip danger in forks, the fallback token won't let it write comments in PRs anyway

.github/workflows/generate_github_pages.yml

@@ -9,7 +9,7 @@ jobs:
   generate-github-pages:
     runs-on: ubuntu-latest
     # Skip in forks
-    if: github.repository == 'element-hq/element-x-android'
+    if: ${{ github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == 'element-hq/element-x-android' }}
     steps:
       - name: ⏬ Checkout with LFS
         uses: nschloe/action-cached-lfs-checkout@v1.2.2