limesurvey: use mariadb instead of postgres

this should allow us to more easily migrate from our current limesurvey
instance on libocedrus.

hosts/hainich/services/limesurvey.nix

@@ -19,9 +19,10 @@
           name = "LimeSurvey";
           components = {
             db = {
-              connectionString = "pgsql:dbname=limesurvey;host=localhost;port=5432;user=limesurvey";
+              connectionString = "mysql:host=localhost;port=3306;dbname=limesurvey";
               username = "limesurvey";
               tablePrefix = "limesurvey_";
+              charset = "utf8mb4";
             };
             assetManager.basePath = "/var/lib/limesurvey/tmp/assets";
             urlManager = {
@@ -48,20 +49,33 @@
       };
 
 
-      services.postgresql = {
+      # services.postgresql = {
-        enable = true;
+      #   enable = true;
+      #   ensureDatabases = [ "limesurvey" ];
+      #   ensureUsers = [ {
+      #     name = "limesurvey";
+      #     ensurePermissions = { "DATABASE limesurvey" = "ALL PRIVILEGES"; };
+      #   } ];
+
+      #   authentication = lib.mkForce ''
+      #     # Generated file; do not edit!
+      #     local all all              trust
+      #     host  limesurvey limesurvey ::1/128      trust
+      #   '';
+      # };
+      #
+
+      services.mysql = {
+        package = pkgs.mariadb;
+
         ensureDatabases = [ "limesurvey" ];
         ensureUsers = [ {
           name = "limesurvey";
           ensurePermissions = { "DATABASE limesurvey" = "ALL PRIVILEGES"; };
         } ];
-
-        authentication = lib.mkForce ''
-          # Generated file; do not edit!
-          local all all              trust
-          host  limesurvey limesurvey ::1/128      trust
-        '';
       };
+
+
       networking.firewall.allowedTCPPorts = [ 80 ];
     };
   };