refactor: conda base

docker/conda.dockerfile

@@ -1,6 +1,24 @@
 ARG BASE=python:3.7
+
+FROM ${BASE} AS conda-installer
+
+ARG CONDA_VERSION=3
+ARG MINICONDA_VERSION=4.5.11
+
+RUN apt-get update \
+    && apt-get -y install wget \
+    && wget --quiet \
+        -O miniconda.sh \
+        https://repo.anaconda.com/miniconda/Miniconda${CONDA_VERSION}-${MINICONDA_VERSION}-Linux-x86_64.sh \
+    && bash miniconda.sh -b -p /opt/conda
+
 FROM ${BASE}
 
+ENV PATH /opt/conda/bin:${PATH}
+COPY --from=conda-installer /opt/conda/ /opt/conda/
+RUN ln -s /opt/conda/etc/profile.d/conda.sh /etc/profile.d/conda.sh \
+    && echo ". /opt/conda/etc/profile.d/conda.sh" >> "${HOME}/.bashrc" \
+    && echo "conda activate base" >> "${HOME}/.bashrc"
 RUN apt-get update --fix-missing \
     && apt-get install -y wget bzip2 ca-certificates curl git \
     && apt-get clean \