Added Github Action to Compile Examples on ESP8266

[shafr]

Hi, I've added compilation of all examples, so you would see if something would fail here in Github.
There are few tests failing - not sure what version of ArduinoJson it should be using - latest 6 fails with missing methods.

Please squash while merging.

[tablatronix]

Yeah there is an example that needs to be updated I think I just need to copy it over from hotfixes or a pr

[tablatronix]

Thanks , I will try to clean up examples, need to add esp32

[tablatronix]

Thanks all , travis is down (migrate to .com required) I do not have repo access to migrate it, so this will be useful. I will fix the arduinojson example and just remove 5.x entirelty.

[tablatronix]

-[ ] add pull_request ?
-[ ] add branches filter (master)

to trigger

[shafr]

done in #1264

Later probably also path filtering can be done - to ignore readme.md or some other non-essential paths.

Also not sure how true checks are with a library that is referenced from git, especially if it is developed in custom branch.

[tablatronix]

Thanks I will look it over and rework as needed, I will be cleaning up examples anyway for a beta release soon