Possible recommendation to fix Scala installation

[bishabosha]

Edit: I tested this now

fixes #238

[bishabosha]

With the second commit this is working locally - so now by default (i.e. the latest stable) it will look for the prebuilt binary on GitHub, but for any requested explicit version less than 3.5.0-RC1 its going to install the traditional way

[bjornregnell]

This is great! many thank @bishabosha

Perhaps write in blog-post and install pages "If you get this warning ... do cs install scala:3.5.0 " ? so people still with old installer get to know the workaround before grit wears.

[tgodzik]

I think this should work with the need for 3.5.0 suffix, no?

[tgodzik]

Thanks Jamie!

[bjornregnell]

I think this should work with the need for 3.5.0 suffix, no?

Yes I hope when this fix is out suffix should not be needed. But in the meantime and if people already have downloaded the thing and saved it somewhere or if the warning might resurrect somehow and it maybe doesn't hurt to tell about the work-around... But it depends how long it takes for the fix to get to users.