Feat/htsget instructions submodules

[wna-se]

I would like to pin the versions of the starter kit components using git submodules. Ideally, I would like to run:

git clone https://github.com/NBISweden/ejprd.git
git checkout --recurse-submodules feat/htsget_instructions
docker-compose --project-directory config/gdi-starter-kit up -d

[wna-se]

This branch supports starting all the services with the single command:

docker-compose --project-directory config/gdi-starter-kit up -d

docker-compose.ovverride.yml adds the following to the original configuration:

• healthcheck.test compatible with docker-compose running with Podman as back-end
• networks: - oidc and extra_hosts: !override [] added to replace internal docker-host network with a configurable solution
• restart: never to simplify trouble shooting
• credentials.build to avoid running apt-get and pip install on every restart