add linting for shell scripts and Dockerfiles

* add hadolint for dockerfile linting
* add hadofile config
* add checks for dockerfiles and shellcheck into makefile
* shellcheck fixes
* add workaround so that .env can be sourced again from version.sh
* hadolint fixes
* print progress of build/run.sh
* fix check for jq in setup.sh

relates to #41 and #26

build/Dockerfile

@@ -1,6 +1,6 @@
 FROM docker:18.09.1
 ENV COMPOSE_VERSION "1.23.2"
-RUN apk add bash curl expect make nano jq py-pip
+RUN apk add --no-cache bash curl expect make nano jq py-pip
 RUN pip install --no-cache-dir docker-compose==${COMPOSE_VERSION}
 WORKDIR /kopano-docker
 CMD ["bash"]