Catalog image build by oc-mirror in crashloopback: cache is invalid

Issue related to the
https://issues.redhat.com/browse/OCPBUGS-12257
https://issues.redhat.com/browse/OCPBUGS-12236

The issue still persists even after the bug has been fixed.
When using 4.14 version of the oc-mirror the "redhat-operator-index" image is still not crashing with error:

```
time="2023-04-20T05:24:15Z" level=fatal msg="cache requires rebuild: cache reports digest as \"xxx\", but computed digest is \"yyy\""
```

The current workaround is to build the custom image and override the Entrypoint.
Same as reported in https://access.redhat.com/solutions/7006771

```
               "Entrypoint": [
                    "/bin/opm"
               ],
               "Cmd": [
                    "serve",
                    "/configs",
                    "--cache-dir=/cache"        <<<<<<<<<< remove that part
               ],
```

I believe that the issue is in the "redhat-operator-index".
The image still uses the cache, but the "oc-mirror" doesn't use that.

OpenShift Container Platform:
- 4.14
- 4.13
- 4.12

    

Reproducible on customer environment.
Customer uses the latest 4.14 image for the "redhat-operator-index".
    

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