Mark experimental builds at the start of their filename

[pajlada]

Description

also manually mark the builds as experimental instead of using a god of
war sed replace

The test for if this works can only be checked in the nightly release once this has been merged into the main branch

[Mm2PL]

Pepega 📣 EXPERIMENTAL

[Mm2PL]

@pajlada I don't think it worked https://github.com/Chatterino/chatterino2/actions/runs/4715589021/jobs/8362890140

[Felanbird]

edit: Now that I look at it again Chatterino-ubuntu-22.04-Qt-6.2.4.deb isn't one of the options prior to this PR - looks like it never made it but it's only an issue now because we are explicitly looking for it. https://github.com/Chatterino/chatterino2/releases/tag/nightly-build

For some reason the Chatterino-ubuntu-22.04-Qt-6.2.4.deb file is just not downloading.
Throwing ls into the mix returns all the artifacts except that one
https://github.com/Felanbird/chatterino2/actions/runs/4716725597/jobs/8365024218

(was also trying setting the path manually, encase working-directory wasn't working)

[Wissididom]

I assume it could also be that it simply overwrites the file. When I look into Felanbirds Workflow I see that those Ubuntu files do not contain anything that specifies the Qt version and since 22.04 is built for 5.15.2 and 6.2.4 the 5.15.2 version might just have been overwritten by the 6.2.4 version when downloading (when looking at the step order), because both are named Chatterino-ubuntu-22.04-x86_64.deb. So I see 3 options being either to rename the file inside the CreateUbuntuDeb.sh or somewhere prior to uploading it or to download it and after downloading the 5.15.2 to rename it and then downloading the 6.2.4 and rename that.

Their filenames currently are Chatterino-ubuntu-20.04-x86_64.deb and Chatterino-ubuntu-22.04-x86_64.deb according to Felanbirds Workflow.