Create docker-compose to run integration tests easily locally

[embano1]

Acceptance criteria:

• Docker compose file w/ hardcoded image versions (SHA)
• Github actions to use the same file
• Documentation

Ref: #963

[duglin]

In general I'm ok with this, but it does raise the bar of what's required of devs. Personally, I don't use (or have installed compose) I if needed I can adapt :-)

[embano1]

Compose comes with Docker (which we require already today). Based on my experience, it actually simplifies the developer experience and prevents common issues in multi-container setups.

[duglin]

oh cool - for some reason I thought it was a separate install.

[embano1]

Yup, assuming most users have Docker Desktop installed

Compose V2 is included with all currently supported versions of Docker Desktop. For more information, see Migrate to Compose V2.

Compose V2 integrates compose functions into the Docker platform, continuing to support most of the previous docker-compose features and flags. You can run Compose V2 by replacing the hyphen (-) with a space, using docker compose, instead of docker-compose.