Use smaller string column than varchar255

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You can also use the size option in the migration. Here’s an example from the ecto_sql tests:

https://github.com/elixir-ecto/ecto_sql/blob/da96dad6275cec53541463ae057bb6c0ec49783b/test/ecto/adapters/postgres_test.exs#L1179

Note how name is generated as a VARCHAR(20).