Create `main.yml`

[SomeMoosery]

Creates a script with GitHub Actions to automatically deploy our site to our QA S3 bucket

⚠️ IMPORTANT: Please do not create a Pull Request without creating an Issue first.

All changes need to be discussed before proceeding. Failure to do so may result in the pull request being rejected.

Before submitting a pull request, please be sure to review:

• Our Code of Conduct: https://github.com/COVID-19-electronic-health-system/.github/blob/master/CODE_OF_CONDUCT.md
• Our Contributing Guidelines: https://github.com/COVID-19-electronic-health-system/.github/blob/master/CONTRIBUTING.md
• Our Support documentation: https://github.com/COVID-19-electronic-health-system/.github/blob/master/SUPPORT.md

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Please include the issue number the pull request fixes by replacing YOUR-ISSUE-HERE in the text below.

Fixes #270

Summary

Sets up continuous deployment to our QA S3 bucket

Details

• Runs a GitHub actions script that deploys to our QA S3 bucket when code is merged into master
• Adds secrets to GitHub (AWS Credentials and bucket name)

Test Plan (required)

Once this change merges in, we'll see if it automatically deploys

Final Checklist

• [x] For CoronaTracker, did you bump the version in package.json?
  • Update the second decimal for a major change
  • Update the third decimal for a minor change
  • Numbers can go past 9, e.g. 1.0.9 => 1.0.10
  • For more info, read about Semantic Versioning
• [x] Did you add any new tests as necessary?
• [x] Is your PR rebased off the most current master?
• [x] Have you squashed all commits? (can be done at merge)
• [x] Did you use yarn not npm? (important!)
• [x] Did you use Material-UI wherever possible?
• [x] Did you run yarn lint on the code?
• [x] Did you run all of your most recent changes locally to make sure everything is working?