Document Airgap Setup for Gradle

[tsmaeder]

Test and document the process of setting up an airgap solution for Gradle. In particular, configure a workspace based on our default gradle devfile to use a repository that uses a self-signed certificate.

This will probably involve the use of a maven init script. Documentation in this issue, for the moment.

[svor]

The document with AirGap solution is here: https://docs.google.com/document/d/1t34uXwIfbRn1u6aDidj2iFRzxXtwdWORRyEWeYotVFE/edit?usp=sharing

[tsmaeder]

I commented on the doc. The general "problem" seems to be that the approach to air-gapping is based on changing files inside the project. Did you investigate an approach that can work for any project you check out? For example, changing ~/.m2/settings.xml overrides repos for all project we checkout into the workspace.

[svor]

It is possible to configure repositories globally, I've added how to do that here https://docs.google.com/document/d/1t34uXwIfbRn1u6aDidj2iFRzxXtwdWORRyEWeYotVFE/edit#bookmark=id.rsxt9icf51jc
I didn't find a way to set some global property to use custom sources or another version of Gradle except of using Gradle Wrapper: https://docs.google.com/document/d/1t34uXwIfbRn1u6aDidj2iFRzxXtwdWORRyEWeYotVFE/edit#bookmark=id.bmowz0695wnb