dockerfile formatting and minor fix

Author: joernhees

Dockerfile

@@ -2,10 +2,17 @@
 FROM joernhees/virtuoso:latest
 
 ENTRYPOINT []
-RUN export LC_ALL=C ; RUN ln -s /usr/bin/isql-vt /usr/local/bin/isql
-RUN apt-get update ; apt-get install -y make build-essential libssl-dev zlib1g-dev libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev libncursesw5-dev xz-utils tk-dev libffi-dev liblzma-dev git lzop
-RUN curl -L https://raw.githubusercontent.com/pyenv/pyenv-installer/master/bin/pyenv-installer | bash ; export PATH="/usr/local/var/pyenv/bin:$PATH" ; export PYENV_ROOT="$HOME/.pyenv" ; eval "$(pyenv init --path)"
-RUN pyenv install 2.7.18 ; pyenv global 2.7.18 ; pip install --upgrade pip virtualenv
+RUN export LC_ALL=C \
+    && ln -s /usr/bin/isql-vt /usr/local/bin/isql
+RUN apt-get update \
+    && apt-get install -y make build-essential libssl-dev zlib1g-dev libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev libncursesw5-dev xz-utils tk-dev libffi-dev liblzma-dev git lzop
+RUN curl -L https://raw.githubusercontent.com/pyenv/pyenv-installer/master/bin/pyenv-installer | bash \
+    && export PATH="/usr/local/var/pyenv/bin:$PATH" \
+    && export PYENV_ROOT="$HOME/.pyenv" \
+    && eval "$(pyenv init --path)"
+RUN pyenv install 2.7.18 \
+    && pyenv global 2.7.18 \
+    && pip install --upgrade pip virtualenv
 
 COPY requirements.txt /tmp
 RUN pip install -r /tmp/requirements.txt