Ian Wienand edbf1fa45b Switch ARM64 testing to bullseye
This more closely matches the nodepool-builder container, which is
Bullseye based.

Refactor to remove unnecessary abstract job.

Change-Id: I34822608f19e1ce9ef781034ff831d6359ed8e15
2021-10-21 16:00:05 +11:00
..
2021-10-21 16:00:05 +11:00
2021-10-21 16:00:05 +11:00