add support for docker commit command

## Description

There are 2 ways to build an image in docker:

* ```
docker build ...
```
* ```
container=$(docker run ...)
# do stuff in container
docker stop $container
docker commit $container
```

Currently chalk only supports first approach which adds chalk metadata to the built image. We should add support for doing something similar for the second case.

## Result

Created images from running containers will be chalked which will include repo metadata/etc

## Wrapping

The complexity will be how to make it work with entrypoint wrapping/etc. But that can be done with intermediate docker build internally:

```
container=$(docker run ...)
# do stuff in container
docker stop $container
chalk docker commit $container

# internally:
docker commit $container chalk-tmp
docker build . -f - < <(cat <