add support for docker commit command

[miki725]

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 <tag>
  

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 <tag>

# internally:
docker commit $container chalk-tmp
docker build . -f - < <(cat <<EOF
FROM chalk-tmp
COPY /chalk /chalk
...
EOF
)

This should allow to reuse all the logic from the docker build flow as well.