_1password-gui: improve update-script to be more flexible

    echo "$CHANNEL ${ARCH}-${OS}: $CURRENT_HASH"

}

if [[ -z "$STABLE_VER" && -n "$1" ]]; then

    STABLE_VER="$1"

fi

if [[ -z "$BETA_VER" && -n "$2" ]]; then

    BETA_VER="$2"

fi

if [[ "${BETA_VER: -4}" != "BETA" ]]; then

    BETA_VER="$BETA_VER.BETA"

fi

if [[ -z "$STABLE_VER" ]]; then

    echo "No 'STABLE_VER' environment variable provided, skipping"

else