gitlab-ci: add issuebot pages job to run on merge requests
gitlab-ci: add issuebot pages job to run on merge requests

This won't run automatically yet since the trigger has not been setup. But
it will be there for manual testing until the trigger stabilizes.  There
can be only one "pages" job, so git_stats was moved to fdroid.gitlab.io.

f-droid/fdroiddata,f-droid/fdroiddata