set build_by_default on arm64

[Dimitri John Ledkov]

In [19]: lp.load('/+processors/arm64').build_by_default
Out[19]: False

Please set arm64 processor build_by_default to True, such that arm64 builds are configured as on by default when creating new Archives in the future.

[Łukasz Zemczak (sil2100)]

+1 on that from my side at least, but let's wait for Colin to get back.

[Dimitri John Ledkov (xnox)]

@launchpad team ping

[Colin Watson (cjwatson)]

In principle I'm OK with this, but graphs show that arm64 is very clearly still the long pole in the tent in terms of build queue times, so I don't think we can practically do this right now without causing serious issues. We do apparently have some progress on ordering more hardware here, so this may be sorted out in the medium term; once that's the case I think we can look at this.