Build image, run container, connect to already running container and investigate

                  # build container
docker build --no-cache -t image_name -f path-to/Dockerfile --build-arg PAT=pat .

# run container with env file
docker run -d --env-file ./env.file --name container_name image_name

# connect to container as root user
docker exec -it --user root container_name /bin/sh

# install curl
apk add curl

# issue HTTP call to running service on port 8080
curl -v http://localhost:8080/service_name