Sample "TwoProjectMigrations" can't load assembly for migration

I was refactoring my application to support multiple DB providers in accordance with the "TwoProjectMigrations" sample, hitting a roadblock on actually using the migrations for migrating. Turns out I get the same error with the sample:

I hijacked the Worker.Execute() method to run a migration as follows:

```
using var scope = _services.CreateScope();
var services = scope.ServiceProvider;
var context = services.GetService();
context.Database.Migrate();
```

Resulting in this error:

`System.IO.FileNotFoundException: Could not load file or assembly 'SqlServerMigrations, Culture=neutral, PublicKeyToken=null'. The system cannot find the file specified.`

Is this not the right approach?