add configmap which can contain dashboard info and RBAC to access this configmap

[cpanato]

Changes

As of now, we fetch the version of pipelines through labels present on the
deployments which are read by tools such as tkn cli and display the
version. This version may not be displayed to users if they don't have
permission to view the deployment.

In this commit, we are adding

• A ConfigMap which contains version information.
• RBAC which will give appropriate permissions to view the ConfigMap
  irrespective of whether user is has permission to view other objects in
  that namespace or not.

Similar that were done in tektoncd/pipeline#3971 and tektoncd/triggers#1114

This is covered as part of TEP-0041

Fixes: #2089

/kind feature

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[tekton-robot]

Hi @cpanato. Thanks for your PR.

I'm waiting for a tektoncd 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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[AlanGreene]

Thanks or the PR @cpanato, it'll be good to be consistent with the other projects. I've added a couple of comments, let me know if you have any questions.

/ok-to-test

[AlanGreene]

Looks great, thanks @cpanato

/lgtm
/meow

[tekton-robot]

@AlanGreene:

In response to this:

Looks great, thanks @cpanato

/lgtm
/meow

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[tekton-robot]

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This pull-request has been approved by: AlanGreene

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