Make osdisk size configurable

[tervis-unikie]

Default osdisk sizes:

• jenkins-controller: 150 GB
• builder: 150 GB
• binary-cache: 50 GB

[henrirosten]

@tervis-unikie : thanks for this change.

I think we should make the disk size configurable per environment, something similar to:

ghaf-infra/terraform/main.tf

Lines 69 to 88 in e2c0783

	opts = {
	priv = {
	vm_size_binarycache = "Standard_D1_v2"
	vm_size_builder = "Standard_D2_v3"
	vm_size_controller = "Standard_D2_v3"
	num_builders = 1
	}
	dev = {
	vm_size_binarycache = "Standard_D1_v2"
	vm_size_builder = "Standard_D4_v3"
	vm_size_controller = "Standard_D4_v3"
	num_builders = 1
	}
	prod = {
	vm_size_binarycache = "Standard_D2_v3"
	vm_size_builder = "Standard_D8_v3"
	vm_size_controller = "Standard_D8_v3"
	num_builders = 2
	}
	}

and a usage example, for instance in:

ghaf-infra/terraform/jenkins-controller.tf

Line 26 in e2c0783

virtual_machine_size = local.opts[local.conf].vm_size_controller

If you prefer having this merged first, and then later follow-up with another PR to take care of making it part of environment-specific configuration options, that's also fine.

[tervis-unikie]

That is a good idea, but I'll rather merge this and then make another PR.