grafana: replace caddy with nginx

...so that it's automatically included in public-access-proxy

hosts/containers/grafana/default.nix

@@ -20,12 +20,16 @@
   # collectd
   networking.firewall.allowedUDPPorts = [ 25826 ];
 
-  services.caddy = {
+  services.nginx = {
     enable = true;
-    config = ''
-      grafana.hq.c3d2.de
-      reverse_proxy localhost:3000
-    '';
+    virtualHosts = {
+      "grafana.hq.c3d2.de" = {
+        default = true;
+        enableACME = true;
+        forceSSL = true;
+        locations = { "/".proxyPass = "http://localhost:3000/"; };
+      };
+    };
   };
   services.grafana = {
     enable = true;