Fix container registry image uploads for git server

Do this by disabling checking of client request body size.

config/hosts/git/nginx.nix

@@ -34,6 +34,10 @@
         return = "200 \"User-agent: *\\nDisallow: /*/*/archive/\\n\"";
       };
     };
+
+    # Disable checking of client request body size to make container registry
+    # image uploads work.
+    clientMaxBodySize = "0";
   };
 
   networking.firewall.allowedTCPPorts = [ 80 443 ];