Add password in conn string for backup script

[JerryHue]

Issue This PR Addresses

Fixes #3459.

Type of Change

• Bugfix: Change which fixes an issue
• New Feature: Change which adds functionality
• Documentation Update: Change which improves documentation
• UI: Change which improves UI

Description

This PR adds the password to connect to Postgres through a connection string.

Steps to test the PR

1. Start the services.
2. Enter some information into a few tables.
3. Login into the pg-backup-cron-job container (docker exec -it pg-backup-cron-job sh).
4. Instead of waiting for the cron job to be executed, you may execute the file with the following command: /etc/periodic/daily/create-backup. After the command has been executed, there should be a file in /var/opt/pg_dumps, similar to 2022-04-08-02231.dump, make a note of its name.
5. After getting the backup file, modify the database by deleting those tables with data.
6. To restore those tables, run the restore-backup file with the following command: ./restore-backup /var/opt/pg_dumps/2022-04-08-02231.dump, for example.

Checklist

• Quality: This PR builds and passes our npm test and works locally
• Tests: This PR includes thorough tests or an explanation of why it does not
• Screenshots: This PR includes screenshots or GIFs of the changes made or an explanation of why it does not (if applicable)
• Documentation: This PR includes updated/added documentation to user exposed functionality or configuration variables are added/changed or an explanation of why it does not(if applicable)

[gitpod-io]

[humphd]

Nice