update group permissions in deploy.

.github/workflows/build.yml

@@ -31,6 +31,9 @@ jobs:
 
       - name: Deploy to /opt/immersive
         run: |
+          # Ensure group write so we can delete old files
+          chmod -R g+w /opt/immersive || true
+
           # Remove old files except data directory
           find /opt/immersive -mindepth 1 -maxdepth 1 ! -name 'data' -exec rm -rf {} +
 
@@ -40,8 +43,9 @@ jobs:
           # Remove unnecessary directories
           rm -rf /opt/immersive/.git /opt/immersive/.github
 
-          # Set permissions on start.sh
+          # Set permissions on start.sh and ensure group write for future deploys
           chmod +x /opt/immersive/start.sh
+          chmod -R g+w /opt/immersive
 
           # Set ownership to immersive user
           sudo chown -R immersive:immersive /opt/immersive