Test with FriBiDi on Alpine

[nulano]

Add tests for python-pillow/Pillow#6165

See passing in my repository until the above is merged: https://github.com/nulano/pillow-wheels/runs/5764443231?check_suite_focus=true#step:4:6501

[hugovk]

python-pillow/Pillow#6165 is merged and this build restarted.

The musllinux ones pass for linux-latest and fail for linux: expected, right?

The reason I ask is the linux-latest failed and linux passed on this:

See passing in my repository until the above is merged: nulano/pillow-wheels/runs/5764443231?check_suite_focus=true#step:4:6501

[nulano]

The musllinux ones pass for linux-latest and fail for linux: expected, right?

Yes, linux-latest is building with main which includes the fix, linux builds the last release which doesn't.

The reason I ask is the linux-latest failed and linux passed on this: nulano/pillow-wheels/...

For the test in my repo I changed the selected tag to the fix branch (so linux passed), but linux-latest was grabbing the upstream main branch (without the fix).

[hugovk]

Thanks!