Added dbcontext factory

PostFundManagement.Infrastructure/Database/ApplicationDbContextFactory.cs

@@ -0,0 +1,22 @@
+namespace PostFundManagement.Infrastructure.Database;
+
+public sealed class ApplicationDbContextFactory : IDesignTimeDbContextFactory<ApplicationDbContext>
+{
+    public ApplicationDbContext CreateDbContext(string[] args)
+    {
+        var configuration = new ConfigurationBuilder()
+            .SetBasePath(Directory.GetCurrentDirectory())
+            .AddUserSecrets<IInfrastructure>(optional: true)
+            .AddEnvironmentVariables()
+            .Build();
+
+        var optionsBuilder = new DbContextOptionsBuilder<ApplicationDbContext>();
+
+        var connectionString = configuration.GetConnectionString("PfmDatabase") 
+            ?? throw new InvalidOperationException("Connection string 'PfmDatabase' was not found in configuration.");
+        
+        optionsBuilder.UseNpgsql(connectionString, npgsqlOptions => npgsqlOptions.MigrationsAssembly(typeof(ApplicationDbContext).Assembly.FullName));
+
+        return new ApplicationDbContext(optionsBuilder.Options);
+    }
+}