LibreOffice {fresh,still} test builds are unconditionally succeeded

For LibreOffice, there are two releases (fresh and still) and two type of dockerfiles are supplied to each locales, and their names are like Libreoffice_Archlinux-fresh-*.
github_script.sh detects package name from dockerfiles' name but these names are not recognized because grep cannot parse "libreoffice-{fresh,still}" pattern.

fix it.

Simply renamed dockerfiles with Libreoffice-{fresh,strill}-* pattern.
But a new repository on dockerhub (libreoffice-{fresh,still}) has been created.
That's bad.

Fix github_script.sh.