Allow different versions of containers

tests/Dockerfile

@@ -1,8 +1,11 @@
 # You must build from the root repository directory, not the tests directory
-# docker build -t geometry-zsh-5.0.0 -f tests/Dockerfile .
-# docker run -it geometry-zsh-5.0.0
+# export VERSION=5.7.1
+# docker build -t geometry-zsh:$VERSION -e VERSION=$VERSION -f tests/Dockerfile .
+# docker run -e COLUMNS=$COLUMNS -e LINES=$LINES -e TERM=$TERM -it geometry-zsh:$VERSION zsh
 
-FROM zshusers/zsh:5.0.0
+ARG VERSION=latest
+
+FROM zshusers/zsh:$VERSION
 
 RUN \
   apt update && \
@@ -13,9 +16,10 @@ RUN locale-gen "en_US.UTF-8"
 
 USER geometry
 WORKDIR /home/geometry
-ENV LANG=en_US.UTF-8
+ENV LANG=C.UTF-8
+ENV LC_ALL=C.UTF-8
 ENV TERM=xterm-256color
-ENV DEFUALT_USER=geometry
+ENV DEFAULT_USER=geometry
 
 COPY . geometry
 COPY tests/zshrc .zshrc