Add GitHub Actions (#3337)
Add GitHub Actions (#3337)

Will build in parallel and covers more environments than the Travis build.
HEYAHONG/nodemcu-firmware,nwf/nodemcu-firmware,FelixPe/nodemcu-firmware,nodemcu/nodemcu-firmware,nwf/nodemcu-firmware,nwf/nodemcu-firmware,vsky279/nodemcu-firmware,FelixPe/nodemcu-firmware,eku/nodemcu-firmware,eku/nodemcu-firmware,eku/nodemcu-firmware,nodemcu/nodemcu-firmware,eku/nodemcu-firmware,nwf/nodemcu-firmware,vsky279/nodemcu-firmware,HEYAHONG/nodemcu-firmware,nwf/nodemcu-firmware,nodemcu/nodemcu-firmware,FelixPe/nodemcu-firmware,FelixPe/nodemcu-firmware,nodemcu/nodemcu-firmware,HEYAHONG/nodemcu-firmware,FelixPe/nodemcu-firmware,HEYAHONG/nodemcu-firmware,vsky279/nodemcu-firmware,vsky279/nodemcu-firmware,vsky279/nodemcu-firmware,HEYAHONG/nodemcu-firmware,nodemcu/nodemcu-firmware