shellcheck: annotate errors in Github Action
shellcheck: annotate errors in Github Action

OTAkeys/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT,kYc0o/RIOT,ant9000/RIOT,jasonatran/RIOT,kYc0o/RIOT,authmillenon/RIOT,kaspar030/RIOT,authmillenon/RIOT,OTAkeys/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,miri64/RIOT,ant9000/RIOT,miri64/RIOT,kaspar030/RIOT,kYc0o/RIOT,authmillenon/RIOT,jasonatran/RIOT,OlegHahm/RIOT,OTAkeys/RIOT,jasonatran/RIOT,jasonatran/RIOT,OTAkeys/RIOT,ant9000/RIOT,miri64/RIOT,ant9000/RIOT,kaspar030/RIOT,jasonatran/RIOT,ant9000/RIOT,RIOT-OS/RIOT,OlegHahm/RIOT,kaspar030/RIOT,authmillenon/RIOT,kaspar030/RIOT,kYc0o/RIOT,miri64/RIOT,authmillenon/RIOT,miri64/RIOT,OlegHahm/RIOT,OlegHahm/RIOT,OlegHahm/RIOT