Unable to access mirror registry on port 8443 due to an error "open() "/var/log/nginx/error.log" failed (13: Permission denied")

Issue

• Attempting to access the registry using curl returned a "Connection refused" error.

     # curl -Ikv  https://<registry-name>:8443
     ...
     ...
     ...
     curl: (7) Failed to connect to <registry-name> port 8443: Connection refused

• The quay-app container would start, but soon the nginx process inside it would crash with "Permission denied" errors trying to access its log file.

nginx stderr | nginx: [alert] could not open error log file: open() "/var/log/nginx/error.log" failed (13: Permission denied)
nginx stderr | 2025/04/05 17:49:50 [emerg] 72#0: open() "/var/log/nginx/error.log" failed (13: Permission denied)
nginx stderr | nginx: [alert] could not open error log file: open() "/var/log/nginx/error.log" failed (13: Permission denied)
nginx stderr | 2025/04/05 17:49:51 [emerg] 100#0: open() "/var/log/nginx/error.log" failed (13: Permission denied)