Fix target names in Makefile to reflect support for both container engines(docker and podman)

[ashokpariya0]

What happened:
Fix the target names in the Makefile (lines 113-126). The current targets are named docker-*, but we support both Docker and Podman (as seen in line 14). Therefore, the target name should be updated to reflect support for both container engines.

What you expected to happen:
The target name should be updated to reflect support for both container engines. The docker-* target is being used in various scripts across the automation and hack folders. Therefore, we need to fix the target name and also update the README and any other related files accordingly.

How to reproduce it (as minimally and precisely as possible):

Additional context:

[kubevirt-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.

If this issue is safe to close now please do so with /close.

/lifecycle stale