[github-actions] use matrix for gcc builds (#4851)
[github-actions] use matrix for gcc builds (#4851)


jwhui/openthread,librasungirl/openthread,abtink/openthread,chshu/openthread,srickardti/openthread,chshu/openthread,chshu/openthread,openthread/openthread,librasungirl/openthread,chshu/openthread,lanyuwen/openthread,lanyuwen/openthread,librasungirl/openthread,jwhui/openthread,lanyuwen/openthread,jwhui/openthread,lanyuwen/openthread,openthread/openthread,abtink/openthread,librasungirl/openthread,srickardti/openthread,abtink/openthread,jwhui/openthread,chshu/openthread,bukepo/openthread,bukepo/openthread,srickardti/openthread,abtink/openthread,bukepo/openthread,lanyuwen/openthread,bukepo/openthread,chshu/openthread,srickardti/openthread,openthread/openthread,openthread/openthread,lanyuwen/openthread