November 2021, week 45

From now on, macOS images will only be provided for the
VMware provider.

- macOS 11 image updated to 11.6.1
- macOS 12 image updated to 12.1 beta
- various improvements for the android-builder role
- ctest runner job: $ minicoin run ctest [machine]
- support for per-minicoin-run machine settings
- install-online job installs 6.2.0
- bump mutagen to v0.12.0, remove workaround for bug in
  v0.11.8
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