[ADTL] Add Support for the OSDisk object
Currently the DTL ARM templates does not support the OSDisk object like the regular VM ARM templates.
We need an option to configure the OS disk size when creating Linux VM's. We have a pool of hundreds of Linux VM's in ADTL used as ADO build agents and the default OS disk size of 30GB is not enough.
There is no good way to automate the resizing of the OS disk nor attaching new data disks on Linux.