free disk space for MacOS CI compilation

[AntonioBL]

Trying to solve the packaging problem with Qt5.15.2

Some softwares of the virtual machine not directly used for the compilation were deleted.

• I signed the CLA
• The title of the PR describes the problem it addresses
• Each commit's message describes its purpose and effects, and references the issue it resolves
• If changes are extensive, there is a sequence of easily reviewable commits
• The code in the PR follows the coding rules
• There are no unnecessary changes
• The code compiles and runs on my machine, preferably after each commit individually
• I created a unit test or vtest to verify the changes I made (if applicable)

[AntonioBL]

Ah, because of github new rules, since I am a new contributor to the unofficial MuseScore 3.7 (MuseJojo or JojoScore? 😝 ), the workflow run must be approved by a maintainer. 😅

[Jojo-Schmitz]

Done 😉

[AntonioBL]

Thank you 😃
There was a compilation problem due to dependencies overwriting in HomeBrew. It was not caused by my modifications, but probably by a very recent HomeBrew update.
I tried a workaround similar to the one used before.

... And workflows still need manual trigger 😅

[Jojo-Schmitz]

As I'm currently away from my computer, I'll check all this when I'm back, on the weekend probably

[Jojo-Schmitz]

Oops. I needed to approve again, done now

[AntonioBL]

Ok, now everything should be solved.
The real change is the size of the (virtual) disk unit set by hdiutil. Then I left the instructions reclaiming some ("real") disk space (it can be useful) and I patched the compilation after the updates of HomeBrew.

...Well, workflows have to be approved again 😅 , but the resulting artifact should work ok.

[Jojo-Schmitz]

Can you please explain (again?) why this is needed?

Ah, I see, the problem that #93 tries to fix by downgrading Qt...