Adds PostgreSQL Database Table Schema to Configuration

[chriscannon]

Changes

This allows a schema to be set on the table instead of assuming public.

Submitter Checklist

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• [x] Has Docs included if any changes are user facing
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Release Notes

PostgreSQL table schema can be set using the DB_SCHEMA environment and configuration variable.

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: chriscannon / name: Chris Cannon (9d90c6cc6e428c2d0bdfb29a99164ae7cb5f4517, 5f0c21456e95132c9af17f8dc352a0b26ba41f98)

[tekton-robot]

Hi @chriscannon. 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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[chriscannon]

/kind feature

[sayan-biswas]

/ok-to-test

[tekton-robot]

The following is the coverage report on the affected files. Say /test pull-tekton-results-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
cmd/api/main.go	11.9%	11.7%	-0.2

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: adambkaplan

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/tektoncd/results/blob/main/OWNERS)~~ [adambkaplan] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[chriscannon]

@adambkaplan could you also add a lgtm label so that it can pass the CI validation? Thanks!

[tekton-robot]

@chriscannon: PR needs rebase.

Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.