ci: add multi-artifact build #216
                
     Merged
            
            
          
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Split the CI workflow to generate multiple artifacts. The current board list is split in multiple files, one per FQBN, depending on the new
<board>.build.artifactvariable inboards.txt:zephyr_unoqartifact witharduino:zephyrfor the Arduino Uno Qzephyr_mainartifact witharduino:zephyr_mainfor other official Arduino boardszephyr_contribartifact witharduino:zephyr_contribfor boards not from Arduino (i.e. other eval boards) - the defaultAn extra
zephyrbinary file with all boards is always generated for thesync-zephyr-artifactstool to retrieve all binaries for a specific release.