First pass at a dockerized toolchain.

I've seen a lot more failures. Compose is not the latest. It seems to
sort of work. We should probably parameterize Docker and Compose
versions to ensure we're installing a consistent toolchain.

Signed-off-by: Chad Metcalf <chad@docker.com>

extras/Dockerfile

@@ -0,0 +1,20 @@
+FROM docker:19.03
+
+ARG UID
+ARG GID
+
+RUN apk update && apk add bash bash-completion gawk make netcat-openbsd docker-compose findutils git curl && \
+    rm -rf /var/lib/apt/lists/* && \
+    rm /var/cache/apk/* && \
+    addgroup -S -g $GID awesome && adduser -S -G awesome -u $UID awesome && \
+    ln -s /opt/bats/bin/bats /usr/local/bin/bats && \
+    git clone --depth 1 --branch v1.2.1 https://github.com/bats-core/bats-core.git /opt/bats
+
+COPY bashrc /home/awesome/.bashrc
+
+USER awesome
+
+VOLUME  /code
+WORKDIR /code
+
+ENTRYPOINT ["bash"]