These environment variables are given a default value in the up.sh and local.up.sh (host) scripts, and also in the configure.sh and entrypoint.sh (container) scripts. The default value in any of the host scripts will override the default value in the container scripts.

Example:

HOST_PORT=8000 BASIC_AUTH_ENABLED=true BASIC_AUTH_USER=user BASIC_AUTH_PASSWORD=secure_password ./deploy/local.up.sh

You can also run the container yourself and override the container's command to run a different process instead of the normal application and web server:

docker run --name other-container --rm -v $PWD/src:/var/www/src --rm -e PROJECT_NAME=portfolio portfolio:latest /bin/sh -c "./configure.sh && ruby -v"

To watch the content (see the compiled changes instantly reflect after every change) run

docker exec portfolio /bin/sh -c "jekyll build --source src --destination src/public --watch"

Whenever you want to update the dependencies, delete the lock file (Gemfile.lock), run the project again (with up.sh or local.up.sh)(this will update the dependencies and write the lock file inside the container) and extract the lock files from inside the container with:

docker cp portfolio:/var/www/Gemfile.lock .