ADD : databases : create load and configure postgresql

hosts/next/configuration.nix

@@ -3,6 +3,7 @@
     ./hardware-configuration.nix
     ./nextcloud.nix
     ./backup.nix
+    ./databases.nix
     ../modules/users.nix
     ../modules/common.nix
     ../modules/prometheus-node.nix

hosts/next/databases.nix

@@ -0,0 +1,19 @@
+{config, pkgs, ...}:
+{
+
+networking.firewall.allowedTCPPorts = [ 5432 ];
+# Enable PostgreSQL 
+  services.postgresql = {
+    enable = true;
+    authentication = "host all all 192.168.0.0/16 trust";
+
+    # Ensure the database, user, and permissions always exist
+    ensureDatabases = [ "pizzajoffredb" ];
+    ensureUsers = [
+     { name = "pizzajoffre";
+       ensurePermissions."DATABASE pizzajoffredb" = "ALL PRIVILEGES";
+     }
+    ];
+  };
+
+}