Use LFS for project templates
The following discussion from gitlab-ce!25553 should be addressed: - [ ] @nick.thomas started a [discussion](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/25553#note_145505705): > One does wonder whether we should start using LFS for these project templates. The repository is going to rapidly balloon in size otherwise :thinking_face: > > One for a follow-up issue, methinks. Currently, project templates are stored as `.tar.gz` files in `vendor/project_templates`. They are 4.5MiB and we keep adding new ones. Further, they will require regular updates with new versions. Every time a version bump happens, the old version stays in the repository's history - forever! :scream: I think we should instead use LFS for these files. It's what it's designed to do, and should help us to keep the size of the repository down over time. Thoughts @grzesiek @rymai ? (picking 2 other maintainers at random)
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