Fixed error due to package requirement issue

one of the packages required by cadquery was improperly configured and causes issues with the cadquery import.  Had to change docker base image and modify to include a configured environment to work around the issue.  May require rebuilding or removing and recreating your docker image and containers.

If you continue to encounter an import error please contact me.

docker/Dockerfile

@@ -1,18 +1,23 @@
-FROM mambaorg/micromamba:0.8.2
+FROM continuumio/miniconda3
 
 RUN apt-get update && \
     apt-get install -y libgl1-mesa-glx gcc bash && \
     rm -rf /var/lib/apt/lists/*
 
-WORKDIR /app
-RUN micromamba install -y -n base -c conda-forge -c cadquery \
-    python=3 \
-    cadquery=master \
-    numpy=1 \
-    scipy=1 && \
-    (rm /opt/conda/pkgs/cache/* || true)
+
+COPY ./docker/environment.yml .
+
+RUN conda env create -f environment.yml
+
+RUN conda init bash
+
+SHELL ["bash", "-lc"]
+
+RUN conda activate myenv
 
 RUN pip3 install solidpython
 
+RUN echo "source activate myenv" >> ~/.bashrc
+ENV PATH /opt/conda/envs/myenv/bin:$PATH
 
-WORKDIR /app/src
+WORKDIR /app/src

docker/environment.yml

@@ -0,0 +1,28 @@
+name: myenv
+channels:
+  - cadquery
+  - conda-forge
+  - defaults
+dependencies:
+  - python>=3.6
+  - ipython
+  - ocp=7.5.1
+  - pyparsing
+  - sphinx=3.2.1
+  - sphinx_rtd_theme
+  - sphinx-autodoc-typehints
+  - black=19.10b0
+  - mypy
+  - codecov
+  - pytest
+  - pytest-cov
+  - ezdxf
+  - ipython
+  - typing_extensions
+  - nptyping
+  - nlopt
+  - path
+  - pip
+  - numpy=1
+  - scipy=1
+  - cadquery