#1248: Reuse Docker images in functional tests

tests/Dockerfile

@@ -0,0 +1,7 @@
+ARG PYTHON_VERSION
+FROM python:${PYTHON_VERSION}
+RUN apt-get update -y
+RUN apt-get install -yy --no-install-recommends --no-install-suggests fish tcsh zsh
+RUN pip install --upgrade pip
+COPY . /src
+RUN pip install /src