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

base/Dockerfile

@@ -10,6 +10,7 @@ ARG DEBIAN_FRONTEND=noninteractive
 
 # install basics
 # TODO require python3 or python3-minimal?
+# hadolint ignore=DL3005
 RUN apt-get update && \
     apt-get upgrade -y && \
     apt-get install --no-install-recommends -y \
@@ -31,6 +32,7 @@ RUN sed -i -e 's/# en_US.UTF-8 UTF-8/en_US.UTF-8 UTF-8/' /etc/locale.gen && \
     dpkg-reconfigure --frontend=noninteractive locales && \
     update-locale LANG=en_US.UTF-8
 
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 ENV DOCKERIZE_VERSION v0.6.1
 RUN curl -L https://github.com/jwilder/dockerize/releases/download/$DOCKERIZE_VERSION/dockerize-linux-amd64-$DOCKERIZE_VERSION.tar.gz | tar xzvf - -C /usr/local/bin