Nightly CI build is failing `test_sbt`

[nicolasstucki]

See https://dotty-ci.epfl.ch/lampepfl/dotty/475/1/6

[nicolasstucki]

And again after restarting the nightly build https://dotty-ci.epfl.ch/lampepfl/dotty/476/1/6

[nicolasstucki]

The taste fail to find the main class. The most likely PR to have introduced this change is #6898.

[nicolasstucki]

The taste fail to find the main class. The most likely PR to have introduced this change is #6898.