custom-link-tools: read $SHARED_DIR/config.yaml

[mmazur]

if steps.yaml isn't available

https://issues.redhat.com/browse/AROSLSRE-497

Supersedes #4069

[openshift-ci]

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[openshift-ci]

@mmazur: 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/lint	3097be9	link	true	/test lint
ci/prow/e2e-parallel	3097be9	link	true	/test e2e-parallel

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