CI script and GitHub action

The patches can now be automatically checked against the current Monero's master branch.
The tests are executed on schedule as well.

What's Changed

• Testnet scripts ci by @mj-xmr in #1
• Gh actions by @mj-xmr in #2

New Contributors

• @mj-xmr made their first contribution in #1

Full Changelog: v0.1.1...v0.2