chore: update registry deployment configuration

[svor]

What does this PR do?

Fix deployment configuration for OpenShift

What issues does this PR fix or reference?

eclipse-che/che#20133

How to test this PR?

1. Login into OS cluster
2. Execute command from README to deploy che plugin registry:

  oc new-app -f deploy/openshift/che-devfile-registry.yaml \
             -p IMAGE="quay.io/eclipse/che-devfile-registry" \
             -p IMAGE_TAG="next" \
             -p PULL_POLICY="Always"

3. Devfile registry should be deployed and available. In the output you should see a message:

--> Success
    Access your application via route 'che-devfile-registry-pr.apps.rosa.dzhix-cyddx-yrv.1697.p3.openshiftapps.com' 
    Run 'oc status' to view your app.

4. Try to open route URL from the message and add /devfiles at the end
5. You should see:
   

PR Checklist

As the author of this Pull Request I made sure that:

• The Eclipse Contributor Agreement is valid
• Code produced is complete
• Code builds without errors
• Tests are covering the bugfix
• The repository devfile is up to date and works
• Sections What issues does this PR fix or reference and How to test this PR completed
• Relevant user documentation updated
• Relevant contributing documentation updated
• CI/CD changes implemented, documented and communicated

Reviewers

Reviewers, please comment how you tested the PR when approving it.

[github-actions]

Click here to review and test in web IDE:

[artaleks9]

• Verified on OpenShift v4.13.1 with

$ oc version
Client Version: 4.11.13
Kustomize Version: v4.5.4
Server Version: 4.13.1

the functionality works properly