Consider using the official haskell-docker (slim) image to save disk space

[heueristik]

Check out https://hub.docker.com/_/haskell, in particular haskell:<version>-slim.

[paulcadman]

This would not change the amount of disk space used by builds on the Github Agent. The docker image is run within the agent operating system.

See the documentation: https://docs.github.com/en/actions/writing-workflows/choosing-where-your-workflow-runs/running-jobs-in-a-container