Merge branch 'rztab' into 'master'

Rztab

See merge request !3

.bookignore

+nginx/**
\ No newline at end of file

.gitlab-ci.yml

 variables:
-    REVIEW_IMAGE: docker.rz.tu-harburg.de:5000/docker/nginx:latest
+    REVIEW_IMAGE: docker.rz.tu-harburg.de:5000/docker/nginx--review-apps:latest
     BUILD_IMAGE: docker.rz.tu-harburg.de:5000/docker/gitbook-itbh-glr:latest
     
     DOCKER_CONTAINER_NAME: ${CI_PROJECT_PATH_SLUG}-${CI_ENVIRONMENT_SLUG}
@@ -38,6 +38,7 @@ review:start:
         - sudo docker run --detach --rm --env VIRTUAL_HOST=${CI_ENVIRONMENT_SLUG} --name ${DOCKER_CONTAINER_NAME} ${REVIEW_IMAGE} || true
         - sudo docker run --rm -v $(pwd):/source ${BUILD_IMAGE} build
         - sudo docker cp ./_book/. ${DOCKER_CONTAINER_NAME}:/usr/share/nginx/html
+        - if [ ! -z "${REVIEW_CREDENTIALS}" ]; then mkdir -p ./nginx && echo "${REVIEW_CREDENTIALS}" > ./nginx/credentials && sudo docker cp ./nginx/credentials ${DOCKER_CONTAINER_NAME}:/etc/nginx/htpasswd/credentials; rm -f ./nginx/credentials; fi
     environment:
         name: review/${CI_COMMIT_REF_NAME}
         url: http://${CI_ENVIRONMENT_SLUG}.collaborating.tuhh.de