Change deploy script to specify "main" instead of `default_branch` (#4557)

.github/workflows/deploy.yml

@@ -1,8 +1,12 @@
-name: Deploy
+name: Deploy Main
 
 on:
-  push: {}
-  pull_request: {}
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
 
 jobs:
   deploy:
@@ -22,7 +26,7 @@ jobs:
         env:
           NODE_ENV: production
       - name: Set up SSH
-        if: github.event_name == 'push' && github.ref_name == github.event.repository.default_branch
+        if: github.event_name == 'push' && github.ref_name == 'main'
         run: |
           mkdir ~/.ssh
           echo "${{ secrets.SSH_PUBLIC_KEY }}" > ~/.ssh/id_ed25519.pub
@@ -30,12 +34,12 @@ jobs:
           chmod 600 ~/.ssh/*
           ssh-keyscan -H ${{ secrets.SSH_HOST }} >> ~/.ssh/known_hosts
       - name: Deploy build on server
-        if: github.event_name == 'push' && github.ref_name == github.event.repository.default_branch
+        if: github.event_name == 'push' && github.ref_name == 'main'
         run: | 
           rsync --del --no-times --checksum -vrm dist/* ${{ secrets.SSH_USER }}@${{ secrets.SSH_HOST }}:${{ secrets.DESTINATION_DIR }}
           ssh -t ${{ secrets.SSH_USER }}@${{ secrets.SSH_HOST }} "~/prmanifest --inpath ${{ secrets.DESTINATION_DIR }} --outpath ${{ secrets.DESTINATION_DIR }}/manifest.json"
       - name: Purge Cloudflare Cache
-        if: github.event_name == 'push' && github.ref_name == github.event.repository.default_branch
+        if: github.event_name == 'push' && github.ref_name == 'main'
         id: purge-cache
         uses: NathanVaughn/actions-cloudflare-purge@v3.1.0
         with: