Bake docker-ce into the base image

Speeds up CI runs by quite a bit

.circleci/base-image/Dockerfile

@@ -0,0 +1,22 @@
+FROM continuumio/miniconda3:4.5.4
+
+
+RUN apt-get update --yes
+
+RUN apt-get install --yes --no-install-recommends \
+        apt-transport-https \
+        ca-certificates \
+        curl \
+        gnupg2 \
+        software-properties-common
+
+RUN curl -fsSL https://download.docker.com/linux/debian/gpg | apt-key add -
+
+RUN add-apt-repository \
+        "deb [arch=amd64] https://download.docker.com/linux/debian \
+        $(lsb_release -cs) \
+        stable"
+
+RUN apt-get update --yes
+
+RUN apt-get install --yes  docker-ce