freshrss: do not use auto-generated nginx entry

system/nixos/freshrss.nix

@@ -8,7 +8,7 @@
     passwordFile = config.age.secrets.freshrss-user-password.path;
 
     inherit (secret.freshrss) baseUrl;
-    inherit (secret.freshrss) virtualHost;
+    virtualHost = null; # Disable auto-generated nginx entry
 
     database = {
       type = "pgsql";
@@ -18,4 +18,33 @@
       passFile = config.age.secrets.freshrss-database-password.path;
     };
   };
+
+  # Based on: https://github.com/NixOS/nixpkgs/blob/nixos-unstable/nixos/modules/services/web-apps/freshrss.nix
+  services.nginx = {
+    virtualHosts."${secret.freshrss.virtualHost}" = {
+      http3 = true;
+
+      root = "${config.services.freshrss.package}/p";
+      forceSSL = true;
+      useACMEHost = "kempkens.io";
+
+      # php files handling
+      # this regex is mandatory because of the API
+      locations."~ ^.+?\.php(/.*)?$".extraConfig = ''
+        fastcgi_pass unix:${config.services.phpfpm.pools.${config.services.freshrss.pool}.socket};
+        fastcgi_split_path_info ^(.+\.php)(/.*)$;
+        # By default, the variable PATH_INFO is not set under PHP-FPM
+        # But FreshRSS API greader.php need it. If you have a “Bad Request” error, double check this var!
+        # NOTE: the separate $path_info variable is required. For more details, see:
+        # https://trac.nginx.org/nginx/ticket/321
+        set $path_info $fastcgi_path_info;
+        fastcgi_param PATH_INFO $path_info;
+      '';
+
+      locations."/" = {
+        tryFiles = "$uri $uri/ index.php";
+        index = "index.php index.html index.htm";
+      };
+    };
+  };
 }