feat: dockerize e2e tests

[shazron]

Motivation and Context

For ease of e2e testing, for canary deploys.

How Has This Been Tested?

• create e2e/.env (see .env.example)
• run the local server (see internal adp-storage-state repo, requires a modification to add the second test namespace)
• npm run e2e (to verify it works first), then
• run the e2e via docker (see e2e/e2e.md)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (c24fc29) to head (8bc4c75).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #142   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            6         6           
  Lines          215       215           
  Branches        46        46           
=========================================
  Hits           215       215           

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[moritzraho]

neat!