Add healthcheck script for ECS container health checks

[whi-tw]

What problem does this pull request solve?

Trello card:

Now we sometimes have a sidecar running in the task (AWS ADOT), the ecs task health status is determined by the state of the sidecar, not the state of the main container.

This healthcheck script allows us to configure the healthcheck on the app task to explicitly determine whether the app container is healthy, too.

example config:

  "healthCheck": {
    "command": ["CMD", "/app/bin/healthcheck"],
    "interval": 0,
    "timeout": 5,
    "retries": 3,
    "startPeriod": 60
  }

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• Does it work when run on your machine?
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• Do the end to end tests need updating before these changes will pass?
• Has all relevant documentation been updated?

[github-actions]

🎉 A review copy of this PR has been deployed! It is made of up two components

1. A review copy of forms-runner
2. A production copy of forms-admin

Important

Not all of the functionality of forms-runner is present in review apps.
Functionality such as sending emails, file upload, and S3 submission types are
deliberately disabled for the sake of simplifying review apps.

You should use the full dev environment to test the functionality which is disabled here.

It may take 5 minutes or so for the application to be fully deployed and working. If it still isn't ready
after 5 minutes, there may be something wrong with the ECS task. You will need to go to the integration AWS account
to debug, or otherwise ask an infrastructure person.

For the sign in details and more information, see the review apps wiki page.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud