Update testing infrastructure

.dockerignore

@@ -1,8 +1,8 @@
 .git
 build.bash
 tests
-requirements-dev.txt
 hooks
 scripts
 .*
 Dockerfile
+Makefile

.gitignore

@@ -1,6 +1,7 @@
 .idea
 templates/
 __pycache__
+.pytest_cache
 *.pyc
 .env
 .cache

Dockerfile.devkit

@@ -0,0 +1,37 @@
+FROM debian:buster
+
+ENV LANG=C.UTF-8
+
+RUN set -x \
+    && apt-get update \
+    && apt-get install -y --no-install-recommends \
+        ca-certificates \
+        docker.io \
+        gcc \
+        git \
+        jq \
+        libcurl4-openssl-dev \
+        libssl-dev \
+        python3-dev \
+        python3-pip \
+        python3-setuptools
+
+COPY requirements-dev.txt /marathon-lb/requirements-dev.txt
+COPY requirements.txt /marathon-lb/requirements.txt
+
+# NOTE(jkoelker) dcos-e2e has a large list of strict requrements (== vs >=)
+#                that creates conflicts preventing the command line from
+#                running. By installing it in its own pip transaction, then
+#                allowing subsequent pip to use the existing requirements
+#                (no --upgrade or --force-reinstall) the command line is
+#                available
+RUN set -x \
+    && pip3 install \
+        --no-cache \
+        --upgrade \
+        https://github.com/dcos/dcos-e2e/archive/2018.12.10.0.zip \
+    && pip3 install \
+        --no-cache \
+        -r /marathon-lb/requirements-dev.txt
+
+CMD ["/bin/bash"]