Rework container index CI.

[mohammedzee1000]

The index ci will need a rework to allow two phase runs (one phase to validate core parameters, and another, to validate stuff, based on condition).

Based on this, i will refactor the CI as follows:

• Break up each check into a separate function.
• Re-write index CI engine to run checks, based off a list of checks to run.
• Update invocation of index CI engine with core checks before index pr merge.
• Add another CI invocation step to index CI to check changes that update pre-build, to run specific validations, only for subset of changes, for prebuild containers.

[cdrage]

👍 for being able to run CI without needing CentOS DevCloud

[dharmit]

@cdrage I'm assuming you meant CentOS CI (ci.centos.org). Unit testing is something we can surely do without ci.c.o but integration and functional tests are best left to a CI system IMO.