Move SERVER_SECRET param to an optional workspace

[vdemeester]

Signed-off-by: Vincent Demeester [email protected]

[openshift-ci]

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[vdemeester]

cc @Aneesh-M-Bhat
We shouldn't require the user to have this secret, hence changing the Task to use optional workspace instead.

[openshift-ci]

@vdemeester: 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/osp-nightly-ocp-414-e2e	d7437e3	link	true	/test osp-nightly-ocp-414-e2e

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