Cross Platform Action 0.22.0

Added

• Added support for using the action in multiple steps in the same job (#26).
  All the inputs need to be the same for all steps, except for the following
  inputs: sync_files, shutdown_vm and run.

• Added support for specifying that the VM should not shutdown after the action
  has run. This adds a new input parameter: shutdown_vm. When set to false,
  this will hopefully mitigate very frequent freezing of VM during teardown (#61, #72).

Changed

• Always terminate VM instead of shutting down. This is more efficient and this
  will hopefully mitigate very frequent freezing of VM during teardown
  (#61, #72).

• Use unsafe as the cache mode for QEMU disks. This should improve performance (#67).