OpenRaster Previewing in Repository View
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### Problem to solve
As a project maintainer for an emote repository, we use OpenRaster (ORA) [(Specifications)](https://www.freedesktop.org/wiki/Specifications/OpenRaster/) for the project files because it's an open interchange format that makes it easier to work between applications, especially in a case like a repository where we don't know or want to know really what software contributors may use.
### Intended users
Unknown
This will be useful for project maintainers, or contributors who want to look peek at or images before download/pulling them.
### User experience goal
The user should be able to use the UI with GitLab to preview OpenRaster (.ora) files.
### Proposal
OpenRaster is a simple project format, and it's possible to just pull out the final image or overall project file out of it, so it would be nice if we could have a way to preview the ORA files just like with PNG, JPG, or PDF, etc.
It would be even better if as well as the overall preview, each individual layer could be previewed as well on the side.
### Further details
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### Permissions and Security
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### Documentation
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### Availability & Testing
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What risks does this change pose to our availability? How might it affect the quality of the product? What additional test coverage or changes to tests will be needed? Will it require cross-browser testing?
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* Unit test changes
* Integration test changes
* End-to-end test change
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### What does success look like, and how can we measure that?
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### What is the type of buyer?
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### Is this a cross-stage feature?
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### Links / references
issue