- minor: renamed variable

gitlab-ci/Dockerfile

@@ -3,7 +3,7 @@ FROM sdvharbor.slub-dresden.de/replication/debian:bookworm-slim
 ARG GITDIR
 ENV DEBIAN_FRONTEND=noninteractive
 ENV EXLIBRIS_REPO=https://github.com/ExLibrisGroup/Rosetta.dps-sdk-projects.git
-ENV EXLIBRIS_REPODIR=Rosetta.dps-sdk-projects
+ENV EXLIBRIS_REPO_DIR=Rosetta.dps-sdk-projects
 ENV EXLIBRIS_PATH=/exlibris
 
 RUN apt-get update; \
@@ -23,4 +23,4 @@ RUN apt-get update; \
     ;
 RUN apt-file update;
 RUN git clone https://github.com/ExLibrisGroup/Rosetta.dps-sdk-projects.git
-RUN ln -s ${EXLIBRIS_REPODIR} ${EXLIBRIS_PATH}
+RUN ln -s ${EXLIBRIS_REPO_DIR} ${EXLIBRIS_PATH}