Adjust deploy job guard for rename of master branch

Author: phil-opp

.github/workflows/build-site.yml

@@ -60,7 +60,7 @@ jobs:
     name: "Deploy Generated Site"
     runs-on: ubuntu-latest
     needs: [build_site, check_spelling]
-    if: github.ref == 'refs/heads/master' && (github.event_name == 'push' || github.event_name == 'schedule') && github.repository == 'rust-osdev/homepage'
+    if: github.ref == 'refs/heads/main' && (github.event_name == 'push' || github.event_name == 'schedule') && github.repository == 'rust-osdev/homepage'
 
     steps:
     - name: "Download Generated Site"