Nightly: Make a DMG of the assets in (I hope) the azure pipeline

Automatically generated Surge-FX release

This release is automatically generated every time we push surge-fx
to master. As such it is the latest version of our code and may be
unstable, unusable, unsuitable for human consumption, and so on.

The build date and most recent commits are:

Mon Feb 22 20:34:05 UTC 2021

Most recent commits:

b503ada Update README.md
865aff2 Final 1.7.0 Upgrades (#41)
2da8663 Move to Surge-near-1.70 and JUCE-6.0.1
56ff294 Rename Master to Main
a8e928e Upgrade Surge and JUCE; Add RingMod; Change to non-inst (#40)