LOG-9331: Optimize Dockerfile.unit for resource usage when running tests

[jcantrill]

https://redhat.atlassian.net/browse/LOG-9331

[openshift-ci-robot]

@jcantrill: This pull request references LOG-9331 which is a valid jira issue.

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In response to this:

https://redhat.atlassian.net/browse/LOG-9331

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jcantrill

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• OWNERS [jcantrill]

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[vparfonov]

/lgtm

[jcantrill]

/hold

[vparfonov]

/retest

[jcantrill]

/retest

[vparfonov]

/retest

[vparfonov]

/test images

[vparfonov]

/test cargo-clippy-check

[openshift-ci]

New changes are detected. LGTM label has been removed.

[openshift-ci]

@jcantrill: 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	4a3e9b4	link	true	/test images
ci/prow/unit	4a3e9b4	link	true	/test unit
ci/prow/cargo-fmt-check	4a3e9b4	link	false	/test cargo-fmt-check
ci/prow/cluster-logging-operator-e2e	4a3e9b4	link	true	/test cluster-logging-operator-e2e
ci/prow/clo-functional	4a3e9b4	link	true	/test clo-functional
ci/prow/cargo-deny-check-bans	4a3e9b4	link	true	/test cargo-deny-check-bans
ci/prow/cargo-clippy-check	4a3e9b4	link	false	/test cargo-clippy-check

Full PR test history. Your PR dashboard.

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