add installing results with external database docs

[avinal]

Changes

• Results release contains database by default
• Use patches to remove database component from default install
• fixes Add instructions on setting up an external Postgres database #371

/kind documentation

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[tekton-robot]

Hi @avinal. 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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[avinal]

/kind documentation

[adambkaplan]

/ok-to-test

[adambkaplan]

/approve

Overall this is great! I just called out two items related to database credentials.

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: adambkaplan

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[khrm]

@avinal Please rebase this.

[khrm]

/lgtm

[khrm]

Seems tide was incorrectly requesting to do the rebase.

[avinal]

I believe, it rebases in most cases automatically if needed.