How to fix pipeline failures for crossbuild on salsa?

[Daniele Forsi <iu5hkx@gmail.com>]

Hello,

some pipelines are failing the test-crossbuild-arm64 step apparently
because gcc can't be installed.
How can we fix that?

This happened a few minutes ago:
428 The following packages have unmet dependencies:
429 crossbuild-essential-arm64 : Depends: gcc-aarch64-linux-gnu (>=
4:10.2) but it is not going to be installed or
430 gcc:arm64
431 Depends: g++-aarch64-linux-gnu (>= 4:10.2) but it is not installable or
432 g++:arm64
https://salsa.debian.org/debian-hamradio-team/twclock/-/jobs/3103648

This happened a few days ago:
428 The following packages have unmet dependencies:
429 crossbuild-essential-arm64 : Depends: gcc-aarch64-linux-gnu (>=
4:10.2) but it is not going to be installed or
430 gcc:arm64
431 Depends: g++-aarch64-linux-gnu (>= 4:10.2) but it is not installable or
432 g++:arm64
https://salsa.debian.org/debian-hamradio-team/qsstv/-/jobs/3099474

Another pipeline has failed due to another package; I don't know if
this is related:
368 The following packages have unmet dependencies:
369 libc6-dev:arm64 : Depends: linux-libc-dev:arm64 but it is not
going to be installed
https://salsa.debian.org/debian-hamradio-team/ax25mail-utils/-/jobs/2566925

--
73 de IU5HKX Daniele