Provide Parallels image as VMX applicance

[MichaIng]

Parallels support importing VMX files (native VMware applicanc configs), just double clicking them, which creates a VM with common defaults, as we want it. Compared to PVM appliances, VMX is, apart of the VMDK virtual disk image, a plain text config file, which can be generated easily from Linux console, i.e. via GitHub workflows. This allows us to generate and host a single download for VMware Player/Fusion and Parallels desktop, without sacrificing simplicity to deploy it for end users.