Added a flag to toggle podman build cache while building images

[rebtoor]

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[openshift-ci]

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[dprince]

@rebtoor should we make this configurable? It seems caching could be useful in some contexts right?

[rebtoor]

@rebtoor should we make this configurable? It seems caching could be useful in some contexts right?

Yeah, you're right.

BTW this patch didn't help with the problem that we faced so it could be an (unrequired) improvement. Let me push the fix.

[openshift-ci]

@rebtoor: 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/openstack-operator-build-deploy-kuttl	f816593	link	true	/test openstack-operator-build-deploy-kuttl

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[dprince]

what about just a more generic PODMAN_BUILD_OPTS, similar to the already existing BUNDLE_METADATA_OPTS

[openshift-merge-robot]

PR needs rebase.

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