This is a clone of issue OCPBUGS-11280. The following is the description of the original issue:
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Description of problem:

There is forcedns dispatcher script added by assisted installed installation process that create etc/resolv.conf 

This script has no shebang that caused installation to fail as no resolv.conf was generated. 

I order to fix upgrades in already installed clusters we need to workaround this issue.

Version-Release number of selected component (if applicable):

4.13.0

How reproducible:

Happens every time

Steps to Reproduce:

1.
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Actual results:

Expected results:

Additional info: