fix forwarding for cmdbuild (#17)

Reviewed-on: linux/WebHosting#17
Co-authored-by: Konrad Bucheli <konrad.bucheli@psi.ch>
Co-committed-by: Konrad Bucheli <konrad.bucheli@psi.ch>

conf.d/panda-maintenance.conf

@@ -11,8 +11,14 @@ server {
     ssl_certificate /etc/nginx/certs/panda-maintenance.psi.ch.crt;
     ssl_certificate_key /etc/nginx/private/panda-maintenance.psi.ch.key;
 
+
+    rewrite ^/$ /cmdbuild/ permanent;
     location / {
-        proxy_pass http://panda-maintenance-app:8080/cmdbuild;
+        return 404;
+    }
+
+    location /cmdbuild {
+        proxy_pass http://panda-maintenance-app:8080;
         proxy_set_header Host $host;
         proxy_set_header X-Real-IP $remote_addr;
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;