fix: avoid disposed mariadb connection during startup

JobTrackerApi/Program.cs

@@ -2,6 +2,7 @@ using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.Diagnostics;
 using JobTrackerApi.Data;
 using System.Data.Common;
+using MySqlConnector;
 using Microsoft.AspNetCore.Authentication.JwtBearer;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Identity;
@@ -673,10 +674,14 @@ CREATE TABLE IF NOT EXISTS "GmailConnections" (
     }
     else
     {
-        using DbConnection conn = db.Database.GetDbConnection();
+        var cs = app.Configuration.GetConnectionString("JobTracker");
+        if (!string.IsNullOrWhiteSpace(cs))
+        {
+            using var conn = new MySqlConnection(cs);
             conn.Open();
             EnsureIdentityTablesMySql(conn);
         }
+    }
 
     db.Database.Migrate();