add support for testing on prereleases

[SillyFreak]

I'm not sure if this should be merged, would be interested in others' opinions.

I think it's in general useful to have support for testing on prereleases (conditioned on both a Typst and compatible Tytanic prerelease already existing of course). However, the binstall action we use doesn't support prereleases:

Error: install-action v2 does not support semver pre-release and build-metadata: '0.2.0-rc1'; if you need these supports again, please submit an issue at https://github.com/taiki-e/install-action

So this requires extra measures to use cargo install instead. Also, since a prerelease is not the real thing yet, should the template explicitly use them? And if not, is the infrastructure for prereleases still "appropriate" to include?

Basically the options I see are

• don't merge this
• remove 0.13.0-rc1 from the matrix, but prepare the action for installing Tytanic prereleases
• merge as-is, i.e. referencing the Typst and Tytanic prereleases (they would be replaced with the releases once they're out)

I lean towards this being useful enough for package authors to merge in one of the two ways, but would like others' take on this.

[SillyFreak]

(since 0.13 and Tytanic 0.2 are out, this becomes a lot less urgent and should probably wait for taiki-e/install-action#858)

[SillyFreak]

Thanks to taiki-e/install-action#868, this is now supported without change!