build: add Docker container

Some changes (like `asound.conf`) are not portable and only work on my
machine. This will be fixed in the future.

ref: N25B-284

Dockerfile

@@ -0,0 +1,12 @@
+FROM python:2.7.18-alpine
+
+WORKDIR /app
+
+COPY install_deps.sh requirements.txt ./
+RUN ./install_deps.sh
+
+COPY . .
+
+ENV PYTHONPATH=src
+
+CMD [ "python2", "-m", "robot_interface.main" ]