Add tizen riscv64 rootfs and cross build support

[gbalykov]

Change similar to #11832.

Part of dotnet/runtime#84834
cc @t-mustafin @clamp03 @ashaurtaev

[gbalykov]

cc @am11

[am11]

LGTM, thanks!
cc @janvorli, @akoeplinger

[janvorli]

LGTM, thank you!

[HJLeee]

LGTM, Thank you.

[clamp03]

Thank you

[gbalykov]

@am11 @janvorli can this be merged?

[janvorli]

@gbalykov can you please rebase the change on the latest main?

[gbalykov]

@janvorli done

[am11]

@ViktorHofer, can we lift the "must rebase" restriction from shell scripts which are not used in this repo at all? (which begs the old question; do these scripts really belong here? 😅)

[ViktorHofer]

@ViktorHofer, can we lift the "must rebase" restriction from shell scripts which are not used in this repo at all? (which begs the old question; do these scripts really belong here? 😅)

Unsure what you mean by that. @janvorli would you be able to provide an answer to am11's question?

[am11]

@ViktorHofer, I was referring to these merging policies:

Files under eng/common/cross are not used by the CI in this repository. Can we exclude this path from CI trigger?

[ViktorHofer]

Files under eng/common/cross are not used by the CI in this repository. Can we exclude this path from CI trigger?

Good question for @dotnet/arcade-contrib folks

[gbalykov]

Thank you!