Ensure that the `config` directory is included when generating the
assets so that they can be scanned and used when determining which
classes from Tailwind to generate.
Even though Composer v2 was being pulled from the Composer Docker image,
Composer v1 was still being used.
Because I've added the `/app/bin` path to `$PATH`, a version in
`/app/bin/composer` was being used. The simplest way that I can fix
this is re-ordering the variable so that the path is added after the
originals and the Composer version in `/usr/bin/composer` is used.
Oliver Davies