[nanobox] Allow Full-size Uploads (#4123)

The Nginx configurations used by Nanobox previously neglected to increase the default upload size limit. This PR bumps that value up to the current Mastodon limit of 8MiB.

nanobox/nginx-local.conf

@@ -38,6 +38,8 @@ http {
 
         root /app/public;
 
+        client_max_body_size 8M;
+
         location / {
             try_files $uri @rails;
         }

nanobox/nginx-web.conf.erb

@@ -36,6 +36,8 @@ http {
 
         root /app/public;
 
+        client_max_body_size 8M;
+
         location / {
             try_files $uri @rails;
         }