Add build bash script and a python script for reporting status

Summary:
This commit adds a script build.sh which is expected to run the
build on teamcity.

Test Plan: run scripts locally

Reviewers: deadalnix, freetrader, #bitcoin_abc

Reviewed By: deadalnix, #bitcoin_abc

Subscribers: teamcity

Differential Revision: https://reviews.bitcoinabc.org/D776