jupiter: fix nix cache proxy

modules/services/nas/nginx.nix

@@ -32,8 +32,13 @@
         useACMEHost = "home.opel-online.de";
         forceSSL = true;
         locations."/" = {
-          proxyPass = "https://cache.ci.kabtop.de";
           extraConfig = ''
+            proxy_pass              https://cache.ci.kabtop.de;
+            proxy_ssl_server_name   on;
+            proxy_http_version      1.1;
+            proxy_set_header        Connection "";
+            proxy_set_header        Host cache.ci.kabtop.de;
+
             proxy_cache             nix_cache;
             proxy_cache_valid       200 14d;
             proxy_cache_valid       404 1m;
@@ -70,6 +75,8 @@
     };
   };
 
+  systemd.services.nginx.serviceConfig.ReadWritePaths = [ "/mnt/Pluto/nix-cache" ];
+
   networking.firewall = {
     enable = true;
     allowedUDPPorts = [  ];