Jobs that need to compile code, as opposed to simply installing
prebuilt packages and/or copying in files, probably do not want to run
on a Raspberry Pi. To allow such jobs to opt out of running on a Pi and
wait for the Cluster Autoscaler to bring up an aarch64 node in AWS, the
`buildContainerImage2` function now takes an optional `pi` argument.
The argument defaults to `true`, so existing jobs that expect to run on
a Pi will continue to do so.
Dustin C. Hatch
1b37d9510d