document&minimize network dependencies // create on air-gapped network

[Klaas-]

Is your feature request related to a problem? Please describe.
We have a fairly locked down network, only connections to Azure Services are allowed.
So stuff like the IP lookup:

sap-automation/deploy/scripts/install_workloadzone.sh

Lines 62 to 68 in 267278e

	this_ip=$(curl -s ipinfo.io/ip) >/dev/null 2>&1
	export TF_VAR_Agent_IP=$this_ip
	echo "Agent IP: $this_ip"
	fi
	if [ 1 == $called_from_ado ] ; then
	this_ip=$(curl -s ipinfo.io/ip) >/dev/null 2>&1

sap-automation/deploy/scripts/prepare_region.sh

Line 70 in e5e2955

this_ip=$(curl -s ipinfo.io/ip) >/dev/null 2>&1

sap-automation/deploy/scripts/installer.sh

Line 140 in 267278e

this_ip=$(curl -s ipinfo.io/ip) >/dev/null 2>&1

does not work.

Also the deployer VM being created does not have access to the internet, so it can't download anything via pip for example.

I would like to minimize the dependencies towards the internet and try to operate only with Azure Services reachable. Apart from that for normal installation with internet access I think you should document what resources you actually need as a list of URLs:
http://ipinfo.io
Pip (pypi.python.org, pypi.org, pythonhosted.org)
Terraform (registry.terraform.io, releases.hashicorp.com)
I do not have a complete list yet, those were just the first things I noticed :)

As for an Non-Internet connected (air-gapped) Install:
I think it would be a good idea to have two parts
a) download everything (apart from that which is available directly from Microsoft like OS repos) you need from the internet and put it into a storage account
b) the actual SAP install

Everything in a) you can do on your desktop or on any internet connected machine
Everything in b) will work without internet connection

Describe alternatives you've considered
A lot of enterprises may have internal mirrors for pip/... so it may be a good idea to incorporate that possibility.