Add overlay for enabling logs

[adambkaplan]

Changes

• Added a component to enable the logs feature with PVC-based storage.
• Added an overlay which deploys Results with a local database, and logs enabled with PVC storage.
• Added a README which documents how to deploy with a kustomization and contribute new kustomizations.

/kind documentation

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• [x] Has Docs included if any changes are user facing
• [ ] Has Tests included if any functionality added or changed
• [x] Tested your changes locally (if this is a code change)
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Release Notes

The logs feature with PVC storage can be deployed and tested through a new "logs-local-db" kustomization.

[adambkaplan]

Related to #440

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sayan-biswas

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[enarha]

The change is good and I'll +1. Maybe we run the e2e test with all overlays? That checks both the overlay configuration for errors and the code to get extra coverage. That'll probably also require we use different configs. I'm suggesting we pursue this as a separate issue. @adambkaplan @sayan-biswas WDYT?

[sayan-biswas]

The change is good and I'll +1. Maybe we run the e2e test with all overlays? That checks both the overlay configuration for errors and the code to get extra coverage. That'll probably also require we use different configs. I'm suggesting we pursue this as a separate issue. @adambkaplan @sayan-biswas WDYT?

@enarha I have this PR #470 open, I was waiting for this overlay PR to merged. I'll use the overlays in that.

[enarha]

/lgtm

[sayan-biswas]

/test pull-tekton-results-integration-tests