Docker compatibility update

This release will fix some Docker execution compatibility issues and adds safety checks. It also adds a configuration for the default environment configuration file. In detail:

• allowed to define the default .env file name to be read from project directory or to be passed after start/stop commands, e.g. DockerExec proxy start .env.local
• added a test on using the docker compose extension over docker-compose binary, if installed; you no longer need the separate binary
• updated the output and fixed typos
• added a test for Git to be installed
• updated the generated file contents in DockerExec proxy generate command