docker: Include CI_ env and remove default command

icinga-build-docker

@@ -24,10 +24,6 @@ else
   exit 1
 fi
 
-if [ $# -eq 0 ]; then
-  set -- icinga-build-package
-fi
-
 DOCKER_IMAGE="${ICINGA_DOCKER_ORG}/${TARGET}"
 if [ -n "${ICINGA_DOCKER_REGISTRY}" ]; then
   DOCKER_IMAGE="${ICINGA_DOCKER_REGISTRY}/${DOCKER_IMAGE}"
@@ -51,6 +47,7 @@ trap 'rm -f ${env_file}' EXIT INT
 
 env | grep -e ^ICINGA > "${env_file}" || true
 env | grep -e ^APTLY >> "${env_file}" || true
+env | grep -e ^CI_ >> "${env_file}" || true
 
 echo "[ Running build in Docker ]"
 set -ex