CI: fix labeler for common boards files

[raiden00pl]

Summary

CI: fix labeler for common boards files

fix issue from #18500 (comment)

Impact

Fix labeler for common boards files.
Touching these files should trigger the building of all boards

Testing

CI

[acassis]

@raiden00pl something that I realized about seems boards/Kconfig triggering all boards builds, should separated this Kconfig in: Kconfig.arm, Kconfig.riscv, Kconfig.avr, etc. it could avoid builds all boards just because a new board was added to Kconfig or someone changed a specific symbol in a board.

What do you think?

[linguini1]

@raiden00pl something that I realized about seems boards/Kconfig triggering all boards builds, should separated this Kconfig in: Kconfig.arm, Kconfig.riscv, Kconfig.avr, etc. it could avoid builds all boards just because a new board was added to Kconfig or someone changed a specific symbol in a board.

What do you think?

That seems like a smart idea to me! A lot of PRs will modify these big common files when new boards are added. For instance, in #18500 I give the example of #18397. This patch is completely local to the new board implementation, except for modifying board/Kconfig to add the board to the list of supported options. So that would re-trigger the full CI. Your suggestion makes it so we only need to consider a subset of rebuilds, which would be good!