ci: Try harder to get a working nightly toolchain on VMs

[larseggert]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.72%. Comparing base (d960d0b) to head (4a3afcc).
⚠️ Report is 60 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #95      +/-   ##
==========================================
- Coverage   86.90%   86.72%   -0.18%     
==========================================
  Files           5        5              
  Lines         565      565              
  Branches      565      565              
==========================================
- Hits          491      490       -1     
- Misses         48       49       +1     
  Partials       26       26              

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[larseggert]

OBE