Expand CI testing to cover new Julia releases, no-CUDA setups, ARM, FreeBSD

[IanButterworth]

This includes a few changes:

• Update from 0.7 / nightly to 1.0 / 1.2 / 1.3 / nightly on the major platforms
• Add ARM (drone) and FreeBSD (cirrus)
  • ARM CUDA installers need correct paths (couldn't find the installers..)
• Add testing for setups with no CUDA (installer is now skipped with CUDA = nill)

[IanButterworth]

I guess CI is disabled for PR's. Also, drone and cirrus will likely need enabling.

I think there's merit in testing this so it would be great if all that could be enabled. I can push to re-trigger, once enabled.

[maleadt]

Not disabled, but more impossible to get working on our Gitlab GPU CI (doesn't support mirroring of PRs). Hence Bors. bors try

[bors[bot]]

try

Build failed

• continuous-integration/appveyor/branch

[IanButterworth]

Ah. How about doing ARM on drone and FreeBSD on cirrus but just with CUDA = nil. Just to check for non-breaking in the no CUDA case?

btw, just realized I spelt nil wrong throughout this PR.. 🤦‍♂️

[IanButterworth]

bors try

[bors[bot]]

:lock: Permission denied

Existing reviewers: click here to make ianshmean a reviewer

[maleadt]

Yeah, that's annoying. bors try

[bors[bot]]

try

Build failed

• continuous-integration/travis-ci/push