- Closes#690.
## Type of Change
- [ ] Bug fix
- [x] New feature
- [ ] Breaking change
- [ ] Documentation update
## Motivation and Context
Named volumes are now implicitly created when referenced in container
commands. So, if `myvolume` doesn't exist and you run `container run -v
myvolume:/data alpine`, it is automatically created.
## Testing
- [x] Tested locally
- [x] Added/updated tests
- [x] Added/updated docs