Decrease size of docker image

Combining RUN commands to minimise the number of layers and cleaning up the apt lists to reduce total size.

Author: huisman

Dockerfile

@@ -1,16 +1,22 @@
 FROM python:3.10.8
 WORKDIR /home/pandas
 
-RUN apt-get update && apt-get -y upgrade
-RUN apt-get install -y build-essential bash-completion
+RUN apt-get update && \
+    apt-get -y upgrade && \
+    rm -rf /var/lib/apt/lists/*
 
-# hdf5 needed for pytables installation
-# libgles2-mesa needed for pytest-qt
-RUN apt-get install -y libhdf5-dev libgles2-mesa-dev
+RUN apt-get update && apt-get install -y \
+    build-essential \
+    bash-completion \
+    # hdf5 needed for pytables installation
+    libhdf5-dev \
+    # libgles2-mesa needed for pytest-qt
+    libgles2-mesa-dev && \
+    rm -rf /var/lib/apt/lists/*
 
-RUN python -m pip install --upgrade pip
 COPY requirements-dev.txt /tmp
-RUN python -m pip install -r /tmp/requirements-dev.txt
+RUN python -m pip install --no-cache-dir --upgrade pip && \
+    python -m pip install --no-cache-dir -r /tmp/requirements-dev.txt
 RUN git config --global --add safe.directory /home/pandas
 
 ENV SHELL="/bin/bash"