[WIP] Add support docker compose plugin

[Caroga]

Description

I am using the new docker compose plugin docker-compose-plugin which comes bundled with docker when installing the latest version. This does not require you to install the docker-compose plugin manually and works as part of the docker command.

Notes

• This change will primarily aim to use docker-compose which gives me the feeling it's less of an impact.
• I cannot test this for backwards compatibility as I don't have the docker-compose library anymore, please test.

The Makefile for this project expects to use the docker-compose command to bring up the project.
I've added checks to determine if we can use docker-compose which will in turn check the docker compose API version to determine the separator (existing functionality).

In case docker-compose was not found it will check for the docker compose plugin and will throw an error and exit the program if this is also not found.

Some changes I made:

• Default the SEPARATOR var to _, which will only be overwritten to - in case you are using a older version of docker-compose. The assumption here is that the new docker compose plugin defaults to v2 or higher.
• Introduced DOCKER_COMPOSE_CMD. Defaults to docker-compose, will be overwritten if docker-compose is not found and the docker compose plugin is detected.
• Suppress .env file operation output from the console.

Related issues

None

Todo

• (Not applicable) Ensure any install or build dependencies are removed before the end of the layer when doing a build.
• Update the CHANGELOG.md with details of changes to the project.
• (Not applicable) If applicable, update the README.md or associated documentation to cover the changes to the project.
• Test backwards compatibility with docker-compose

[khalwat]

Let me know when you no longer consider this a WIP, or what specifically you need my input on.

[Caroga]

@khalwat I still consider it WIP due to the backwards compatibility test. I don't have a device with the older docker-compose plugin therefore I cannot test this.
Are you able to perform this test, or maybe someone else?
Once the test for BC is successful I would say the PR is ready.