Should I use a Debian distro with an armv8 architecture if I am looking for stability?
Because the build bots need some loving attention. They've been like this for a few months now, while people have been busy on other things.
The main reason is that the crypto tests include a set of expected values from the pseudo random number generator, which was recently changed to remove a tiny bias, thereby changing the returned values. A patch which was supposed to update the values did not actually fix it, and another needs to be made instead.
The Windows platforms were also broken for a couple days near your post's date when the block/tx notifications went in as they tried to build the POSIX code.
At least one of the ARM build machines is also missing some necessary libraries and needs updating.