[release-1.6] 🐛 CI: Introduces the thumbprint value in CI yaml

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #1860

/assign chrischdi

NONE

[k8s-ci-robot]

@k8s-infra-cherrypick-robot: 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
pull-cluster-api-provider-vsphere-test-release-1-6	005ef82	link	true	/test pull-cluster-api-provider-vsphere-test-release-1-6
pull-cluster-api-provider-vsphere-e2e-release-1-6	005ef82	link	true	/test pull-cluster-api-provider-vsphere-e2e-release-1-6

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[randomvariable]

needs a go mod tidy

[chrischdi]

Nope, go mod tidy unfortunately does not help. But going down on this at #1983 :-)

[chrischdi]

Note: this PR is required to fix CI which is red due to:

Failed to run clusterctl config cluster
Unexpected error:
    <*yamlprocessor.errMissingVariables | 0xc000ccc090>: {
        Missing: [
            "VSPHERE_TLS_THUMBPRINT",
        ],
    }
    value for variables [VSPHERE_TLS_THUMBPRINT] is not set. Please set the value using os environment variables or the clusterctl config file
occurred
/home/prow/go/pkg/mod/sigs.k8s.io/cluster-api/[email protected]/framework/clusterctl/client.go:216}

(which is visible after #1983 gets merged)

[randomvariable]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[chrischdi]

closing in favor of #1983

[chrischdi]

/close

[k8s-ci-robot]

@chrischdi: Closed this PR.

In response to this:

/close

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