Not sure what it is that you are asking.
phpBB uses Github as its repository so yes that is available.
If you are asking if phpBB can be run from Github then to the best of my knowledge Github does not support databases on its pages - only static pages.
If you are asking some other question then you will need to elaborate as to what it is that you are asking for.
Remember: You only know what you know and - you don't know what you don't know!
My CDB Contributions | How to install an extension
I will not be accepting translations for any of my extensions in Github - please post any translations in the appropriate topic.
No support requests via PM or email as they will be ignored