Set gpt partition as bootable if associated to system-boot role

[upils]

Make sure gpt partitions associated to a system-boot role have the bootable attribute set. This was missing and was problematic because uboot failed to find the partition to boot on.

Fixes FR-8056

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.96%. Comparing base (bb3a3fe) to head (4358120).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #227   +/-   ##
=======================================
  Coverage   93.96%   93.96%           
=======================================
  Files          18       18           
  Lines        3429     3431    +2     
=======================================
+ Hits         3222     3224    +2     
  Misses        133      133           
  Partials       74       74           

Flag	Coverage Δ
unittests	93.96% <100.00%> (+<0.01%)	⬆️

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[sil2100]

+1 on this. Since it was an actual issue, do you think we could have a test case for it? Checking if the partition attribute is set in expected bootable partition cases?

[upils]

+1 on this. Since it was an actual issue, do you think we could have a test case for it? Checking if the partition attribute is set in expected bootable partition cases?

And NOW I remember what was missing on this PR! :D I did some manual tests but you are right, I can surely write a test for that, or at least add a check on one of our "full run" tests.