making docker build more efficient

configs/docker/build/Dockerfile

@@ -20,8 +20,9 @@ RUN DEBIAN_FRONTEND=noninteractive TZ=Etc/UTC apt-get -y install tzdata
 
 # Install miniconda
 ENV CONDA_DIR /storage/app/miniconda3
-RUN wget --quiet https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86_64.sh -O ~/miniconda.sh
-RUN /bin/bash ~/miniconda.sh -b -p $CONDA_DIR
+RUN wget --quiet https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86_64.sh -O ~/miniconda.sh \
+    && /bin/bash ~/miniconda.sh -b -p $CONDA_DIR \
+    && rm -v ~/miniconda.sh;
 # Put conda in path so we can use conda activate
 ENV PATH=$CONDA_DIR/bin:$PATH
 
@@ -29,7 +30,7 @@ ENV PATH=$CONDA_DIR/bin:$PATH
 RUN conda env create --file conda-env-py3EWS-withbuilds.yml --prefix /storage/app/EWS_prod/envs/conda/py3EWS
 
 #tidy
-RUN rm -v ~/miniconda.sh conda-env-py3EWS-withbuilds.yml;
+RUN rm -v conda-env-py3EWS-withbuilds.yml;
 
 #these usernames and ids match the production server (IaaS), override when building a local image if needed
 ARG GNAME=ews