Create script to run db_backup and upload to S3

[aloftus23]

fixes #253

🗣 Description

Python script that first runs the database backup script, then uploads the resulting dump files to an S3 bucket. *Cron job will run this at the end of every report period.

💭 Motivation and context

Efficiently backs up the database incase anything happens to it and improves P&E team member's ability to pull down a copy.

🧪 Testing

Passes pre-commits and pytests. Logging included to show any failures.

✅ Pre-approval checklist

• This PR has an informative and human-readable title.
• Changes are limited to a single goal - eschew scope creep!
• All future TODOs are captured in issues, which are referenced
  in code comments.
• All relevant type-of-change labels have been added.
• I have read the CONTRIBUTING document.
• These code changes follow cisagov code standards.
• All relevant repo and/or project documentation has been updated
  to reflect the changes in this PR.
• Tests have been added and/or modified to cover the changes in this PR.
• All new and existing tests pass.

[coveralls]

Coverage remained the same at 26.288% when pulling 4885a4d on AL-dbBackupsS3-dev into 0c89337 on develop.

[lgtm-com]

This pull request introduces 1 alert when merging 4885a4d into 0c89337 - view on LGTM.com

new alerts:

• 1 for Testing equality to None