Include must-gather image name in ENV

[black-dragon74]

The request for such feature came from a Bugzilla
for odf-must-gather.

We want the must-gather containers to be able to check the image being used. This is useful in cases where we want to deduce if the customer is using the image we ask them to.

While it is possible to call the k8s API internally (this is how it is implemented currently for odf-mg), it would be much efficient if the value is present inside the container as an ENV.

This patch sets an ENV var MUST_GATHER_IMAGE to reflect the image source of the pods.

Regards

[openshift-ci]

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[openshift-ci]

@black-dragon74: The following tests 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/images	a02f9cf	link	true	/test images
ci/prow/verify	a02f9cf	link	true	/test verify
ci/prow/rpm-build	a02f9cf	link	true	/test rpm-build
ci/prow/security	a02f9cf	link	false	/test security
ci/prow/unit	a02f9cf	link	true	/test unit
ci/prow/build-rpms-from-tar	a02f9cf	link	true	/test build-rpms-from-tar
ci/prow/e2e-agnostic-ovn-cmd	a02f9cf	link	true	/test e2e-agnostic-ovn-cmd
ci/prow/verify-deps	a02f9cf	link	true	/test verify-deps

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[black-dragon74]

PTAL @ardaguclu @soltysh

[openshift-bot]

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