diff --git a/Dockerfile b/Dockerfile
index 1af7115..276487c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,33 +1,34 @@
 FROM debian:11
 RUN export DEBIAN_FRONTEND=noninteractive && \
   apt-get update && apt-get upgrade -y && \
   apt-get install -y \
     cl-quicklisp \
     default-libmysqlclient-dev \
     git \
-    kubernetes-client
+    kubernetes-client \
+    file
 
 RUN useradd -md /srv/forgerie -s /bin/bash forgerie
 RUN mkdir -p /srv/phabricator /opt/forgerie /srv/forgerie/bin
 COPY docker/.sbclrc /srv/forgerie/.sbclrc
 COPY docker/.gitconfig /srv/forgerie/.gitconfig
 COPY docker/entrypoint.sh /srv/forgerie/bin/entrypoint.sh
 COPY docker/ssh /srv/forgerie/.ssh
 RUN chown -R forgerie:forgerie /srv/forgerie /opt/forgerie
 
 USER forgerie
 WORKDIR /srv/forgerie
 
 # install quicklisp and pulls core dependencies for it to run properly
 RUN sbcl --no-sysinit --no-userinit --noprint \
     --load /usr/share/common-lisp/source/quicklisp/quicklisp.lisp \
     --eval '(quicklisp-quickstart:install :path "quicklisp")' \
     --quit  # to install and configure quicklisp
 
 COPY . /opt/forgerie
 ENV FORGERIE_PATH=/opt/forgerie/
 
 # install quicklisp and pulls core dependencies for it to run properly
 RUN sbcl --quit
 
 ENTRYPOINT [ "/srv/forgerie/bin/entrypoint.sh" ]