ILS-247 adjust to envsubst usage

[karol-wozniak-ibm]

What this PR does / why we need it:
to solve https://jsw.ibm.com/browse/ILS-166

Which issue(s) this PR fixes:
Fixes # https://jsw.ibm.com/browse/ILS-247

Special notes for your reviewer:
ILS-247-Tests.pdf

[ibm-ci-bot]

Hi @karol-wozniak-ibm. Thanks for your PR.

I'm waiting for a IBM member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[ibm-ci-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: karol-wozniak-ibm, pgodowski
Once this PR has been reviewed and has the lgtm label, please assign ycshen1010 for approval. For more information see the Kubernetes Code Review Process.

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[pgodowski]

@bitscuit Can u pls review/merge?

[Daniel-Fan]

Hi,
May I ask that do we expect this S in line 16?