Automate uploads of macOS and Linux PTBs

[vadi2]

Brief summary of issue / Description of requested feature:

macOS and Linux PTB's, since the migration of Github, aren't uploaded automatically to dblsqd[1] anymore. This is because github actions are run out of the azure data centres which have 6 million possible IPs - a bit too many for us to be whitelisting to make.mudlet.org - so we use an asynchronous upload mechanism.

Steps to reproduce the issue / Reasons for adding feature:

1. So PTBs are uploaded in a timely manner again

Error output / Expected result of feature

Automated, daily upload of macOS/Linux PTBs.

Extra information, such as Mudlet version, operating system and ideas for how to solve / implement:

make.snapshots.org notifies an endpoint when it has uploaded new artifacts as they've been made available. Perhaps same mechanism could be used to kick off a github actions build that'll upload artifacts to dblsqd?

[1] - Dblsqd is what provides the updates to Mudlet.