WIP: Temporary PR to share POC for CFE-538 / WRKLDS-456

[sherine-k]

Sharing this PR in order to exchange with the oc-mirror + wrklds + olm teams.

This PR makes changes so that oc-mirror utility

• creates a test func in operator_test.go (commented as it fails for now) to easily test the render
• accepts Operator.Catalog containing oci: and treat them the same way as file:
• tweaks the ref that is passed on to render (remove the file: from the ref, so that renderReference can understand we are refering to an image as a folder
• Combined with the following change in WalkFS, we can see that the error reported is error: error rendering new refs: render reference "/home/skhoury/go/src/github.com/openshift/oc-mirror/rhopid": object '{"apiVersion":"mirror.openshift.io/v1alpha2","kind":"ImageSetConfiguration","mirror":{"additionalImages":[{"name":"registry.redhat.io/ubi8/ubi:latest"}],"helm":{},"operators":[{"catalog":"registry.redhat.io/redhat/redhat-operator-index:v4.11","packages":[{"channels":[{"name":"stable"}],"name":"serverless-operator"}]}],"platform":{"channels":[{"name":"stable-0.2","type":"ocp"}]}},"storageConfig":{"local":{"path":"./"}}}' is missing root schema field

versionFilename := "VERSION" // later to become const

	if root == nil {
		return fmt.Errorf("no declarative config filesystem provided")
	}

	matcher, err := ignore.NewMatcher(root, indexIgnoreFilename)
	if err != nil {
		return err
	}

	versionMatcher, err := ignore.NewMatcher(root, versionFilename)
	if err != nil {
		return err
	}

	return fs.WalkDir(root, ".", func(path string, info fs.DirEntry, err error) error {
		if err != nil {
			return walkFn(path, nil, err)
		}
		// avoid validating a directory, an .indexignore file, or any file that matches
		// an ignore pattern outlined in a .indexignore file.
		if info.IsDir() || info.Name() == indexIgnoreFilename || info.Name() == versionFilename || matcher.Match(path, false) || versionMatcher.Match(path, false) {
			return nil
		}

		cfg, err := LoadFile(root, path)

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

@sherine-k: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/sanity	15e82a7	link	true	/test sanity

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[openshift-merge-robot]

@sherine-k: PR needs rebase.

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