Sample App: Database Migration

[Zazzscoot]

Fixes #5891

Proposed Changes:

• Deployment pod for hosting postgres server
• Service for exposing a port to the deployment pod
• Job for executing sample.sql
• Persistent Volume Claim for allowing the deployment pod to recover data in case of crashes
• Updated README.md

[knative-prow]

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[Zazzscoot]

/cc @Leo6Leo

[Leo6Leo]

Please see the comment @Zazzscoot

[Leo6Leo]

Currently the README.md is not detailed enough, you can take a look at these 2 PRs, and see how doc is organzied. Please follow the same template, and make sure the steps are clear and well-explained. Also make sure you explain the reason behind each step.

Example 1: Sentiment Analysis Doc
Example 2: Camel-K slack sink Doc

[Leo6Leo]

As stated in deployment.yaml, we are using the image from quay.io. I would suggest you to use the same to be consistent.