collabora-online: accept version in the update script

while ! test -f default.nix; do cd .. ; done

NIXPKGS_DIR="$PWD"

if [ "$1" ]; then

  new_version=$1

else

  new_version="$(

    list-git-tags --url=https://github.com/CollaboraOnline/online \

    | grep --perl-regex --only-matching '^cp-\K[0-9.-]+$' \

    | sort --version-sort \

    | tail -n1

  )"

fi

cd "$NIXPKGS_DIR"

update-source-version collabora-online "$new_version"