ci-operator/config/openshift/etcd: use CGO_ENABLED for unit tests

[hexfusion]

This PR addresses a few changes with etcd in 3.5

• etcd as of 3.5 no longer tracks the vendor directory so we need to pass GOFLAGS=-mod=readonly to make build
• etcd now passes the race flag to go test which requires CGO_ENABLED true

[hexfusion]

cc @lilic

[openshift-ci]

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

Test name	Commit	Details	Rerun command
ci/rehearse/openshift/etcd/openshift-4.9/e2e-aws-upgrade	e4cbdbd	link	/test pj-rehearse
ci/prow/pj-rehearse	e4cbdbd	link	/test pj-rehearse

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[hexfusion]

Upgrade rehearsal failure unrelated to change

[lilic]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hexfusion, lilic

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• ci-operator/config/openshift/etcd/OWNERS [hexfusion]

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[openshift-ci]

@hexfusion: Updated the ci-operator-4.9-configs configmap in namespace ci at cluster app.ci using the following files:

• key openshift-etcd-openshift-4.9.yaml using file ci-operator/config/openshift/etcd/openshift-etcd-openshift-4.9.yaml

In response to this:

This PR addresses a few changes with etcd in 3.5

• etcd as of 3.5 no longer tracks the vendor directory so we need to pass GOFLAGS=-mod=readonly to make build
• etcd now passes the race flag to go test which requires CGO_ENABLED true

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.