- Don't set architecture, let Docker host decide it's own platform,
remove `runtime` dependency and don't show default in `--help`
- Remove most tests, we need to check only once if it works on
different platform
- Rename `DeleteImage` to `RemoveImage` to conform to existing
function in `docker` cli, added options to specify `force` and
`pruneChildren`
* Add QEMU to run different architectures
* Update dependencies in `go.mod`
* Add `--container-architecture` flag to specify custom image architecture
Co-authored-by: Casey Lee <cplee@nektos.com>