Add missing flags.yml download

[zachlatta]

What

Describe what the change is solving

If this option is not present, then docker compose up -d errors with:

Error response from daemon: invalid mount config for type "bind": bind source path does not exist: /root/airbyte/flags.yml

It helps to add screenshots if it affects the frontend.

How

Describe the solution

Add the missing flag.

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The one file that was changed.

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