GitLab

Add retry logic to sync/pull commands as workaround for bug in parent `containers` failing for random reasons on random image layers.

NOTE: tests need to be better

allow overwriting of username/password through cli

fix bug with policy checking

refactoring drastically in attempt to modularize sync operations by separating the actual sync logic from the configuration logic

all configuration logic is moved/stored in `cmd` package

all logic unrelated to configuration parsing, such as syncing, manifest generation, image parsing, is delegated to packages within `pkg`

completely restructured `config.yaml` file meant to drive p8kr

restricted commands to:

* pull: synchronize images found in manfiest to transient registry defined by `transient.registry`
* push: synchronize images found in manifests from transient registry to destination registry

- move most logic to pkg for now
- use viper for everything
- remove arguments to be more declarative
- add example config.yaml

a registry by querying the registry `/v2/_catalog`

WARNING: With great power comes great responsibility...

* ported over copy and sync capability
* added parallel sync capability
* added k8s manifests sync capability
* removed all clibs to allow static compiling