[AE-158] Add Github Actions [draft]

[aliphys]

This PR adds workflows for automated compilance checks.

• 🔍 Checks we meet library specifications
• ✅ Check sketches compile on designated platforms
• 🔠 Spelling is correct

[aliphys]

Unable to compile library examples due to

• https://github.com/arduino/compile-sketches/issues/167

Arduino_POSIXStorage library is a dependency of this repo. But the GitHub action cannot find it.

Error: Library source path: https:/github.com/arduino-libraries/Arduino_POSIXStorage doesn't exist
Error: Process completed with exit code 1.