Dockerfile for AzDO Build Agent

[ianphil]

Description

As an engineer, I'd like to have a dockerfile for AzDO build agents, in order to move from the hosted build agents.

Acceptance Criteria

Reference: [Done-Done Checklist] (https://github.com/Microsoft/code-with-engineering-playbook/blob/master/Engineering/BestPractices/DoneDone.md)

• [x] Should have docker in docker capabilities
• [x] Should have a configurable startup script for the azdo agent

Also, here are a few points that need to be addressed:

1. Should not have any of the build dependencies needed for the pipeline

Resources

ref: AzDO Agent Running in Docker

Tasks

1. Create Dockerfile
2. include docker install
3. include startup script
4. document