## Description
Addresses some of the latest issues with the Dockerfile
* Go back to Alpine since it is smaller image. `ash` is available as shell so it is ok
* Add `corso` as UID and GUID 1001 for a predictable default user
* Add `/app/corso` as home directory for the `corso` which should address some of the issues around predictably mapping an external folder.
* Add Kopia config that mirrors the Kopia container from https://github.com/kopia/kopia/blob/master/tools/docker/Dockerfile
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## Type of change
<!--- Please check the type of change your PR introduces: --->
- [x] 🌻 Feature
- [x] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Test
- [ ] 💻 CI/Deployment
- [ ] 🐹 Trivial/Minor
## Issue(s)
* fixes#968
## Test Plan
<!-- How will this be tested prior to merging.-->
- [x] 💪 Manual
- [ ] ⚡ Unit test
- [ ] 💚 E2E
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