restic env vars for azure workload identity

[tesshuflower]

Related issues:
Fixes: #1901

[openshift-ci]

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[sonarqubecloud]

Quality Gate passed

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[openshift-ci]

@tesshuflower: 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/e2e-openshift-helm	eb6623b	link	true	/test e2e-openshift-helm

Full PR test history. Your PR dashboard.

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