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

kwmserver/wrapper.sh

@@ -2,6 +2,7 @@
 
 set -e
 
+# shellcheck disable=SC2154
 if [ -n "$oidc_issuer_identifier" ]; then
 	set -- "$@" --iss="$oidc_issuer_identifier"
 fi