Include main in release install in case there are imports in package root

Zebedee Nichollsrequested to merge
add-missing-dependencies into main

Description

Fixes this failing pipeline: https://gitlab.com/magicc/fgen/-/jobs/5964535570

Merge Request Steps

Please confirm that this pull request has done the following:

  • Tests added
  • Documentation added (where applicable)
  • Changelog item added to changelog/.
Edited by Zebedee Nicholls

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