Docker / Podman Image build added

[sips4711]

Allows to build a container image. Container Image could be used in pipelines when specifying the params "-e channel=stable -e depth=2"

example build: podman run --rm -it -v $(pwd):/documents -e channel=stable -e depth=2 localhost/ocp4upc ocp4upc.sh 4.2.36-4.7

[pamoedom]

Hi Sebastian, thanks for this contribution, much appreciated.

However, there are some things to review:

1. The podman run example should contemplate also SELinux permissions, I think it would be better to put it in the following manner:

$ podman build -t localhost/ocp4upc .
$ podman run --rm -it -v $(pwd):/documents:z -e channel=stable -e depth=2 localhost/ocp4upc ocp4upc.sh 4.2.36-4.7

2. I've tried the script on this manner and the generated graph is not correct, maybe some package version in the alpine distro is different, I'll need to further investigate on this before merging your changes, example:

[From the podman run with alpine]

[From local]

Regards.