Create shared environment file for ECS tasks

[MackHalliday]

User Story - Business Need

• Ticket is understood, and QA has been contacted (if the ticket has a QA label).

While working on #1711, we determined maintaining the environment in the task definition files would be easier if there was a share environment file per environment. The share environment file should be created in the same folder as the other json task files. The shared environment file would be shared among the api, celery, celery-beats, db-downgrade and db-upgrade task definition files.

Developer will have to determine all the unique environment per environment (dev, perf, staging, production) - and move them into a shared file.

ECS will need these integrated into the existing task definitions using a file with a .env extension, using the environmentFiles container defintion parmater

This user story depends on #895

User Story(ies)

As a VA Notify engineer,
I want create a shared environment file for the task definition json files
So that the task definitions json file is easier to maintain.

Additional Info and Resources

• Spreadsheet reviewing all environment and secret keys in the task definition files. To see only the environment variables, filter by 'type'.
• Environment variable files will be stored in environment-specific S3 buckets as specified in Add retries in RequestException #895
• AWS docs on environmentFiles
• AWS docs on how to prepare the file

Acceptance Criteria

• Each environment has its own shared environment file
• env file is pushed to new S3 bucket (created in 895)
• ECS deploys without issue
• Unit and regression testing run as expected

QA Considerations

• Verify key functionality of application works as expected.

Potential Dependencies

[MackHalliday]

CC: @k-macmillan @npmartin-oddball

Hey! I realized I did not submit this ticket to review
https://app.zenhub.com/workspaces/va-notify-620d21369d810a00146ed9c8/issues/gh/department-of-veterans-affairs/notification-api/1945
I apologize for the delay.

@kyle MacMillan
Re-reading Corey's ticket for infra and my own - I realized I'm unclear as to how exactly the new shared environment files will be uploaded to the new S3 buckets and then read from the S3 buckets.

Was hoping to talk to Corey to fill in the gaps but he has been out.

[mjones-oddball]

Hey team! Please add your planning poker estimate with Zenhub @cris-oddball @EvanParish @k-macmillan @kalbfled @mchlwellman

[kbelikova-oddball]

Please add your planning poker estimate with Zenhub @coreycarvalho