Fix healthcheck issue on Docker

[sameersubudhi]

What was the problem?

This PR resolves #LISK-1129

How was it solved?

• Update healthcheck command on the Docker container
• Set the API server host/port within the containers via the env file build script
• Update default API server host to be 0.0.0.0
• Update docker dev script to build image from local

How was it tested?

Start the containers locally with the docker dev scripts
Run: curl --fail http://localhost:3000/healthz and check container health with docker ps

[matjazv]

Tested locally and health check works as expected!