Adds a dockerfile.

To run a test like
```
bazel run :python_random_agent --define graphics=sdl -- --length=10000 --width=640 --height=480
```
use
```
docker build -t lab .
docker run lab bazel run :python_random_agent --define graphics=sdl -- --length=10000 --width=640 --height=480
```

.docker/startup.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+# Based on Frank Carey's pull request
+# https://github.com/deepmind/lab/pull/24
+
+# Remove VNC lock (if process already killed)
+rm -f /tmp/.X1-lock /tmp/.X11-unix/X1
+
+# Set the DISPLAY that will be used by default. Makes lab show up in our xvfb display
+export DISPLAY=:1
+
+# Start the X virtual frame buffer which uses memory instead of an actual device.
+# Allows lab to be run headless.
+echo "Launching xvfb"
+Xvfb "$DISPLAY" -screen 0 "$XVFB_RESOLUTION" &
+
+# Run a lightweight Window Manager (fluxbox is smaller than lxdm, gnome, unity, kde, etc)
+# (pretty sure this is required.)
+echo "Launching fluxbox"
+fluxbox &
+
+# Run the x11vnc server
+# Explanation of options:
+#   -display : This needs to match the xvfb display number
+#   -passwd : Use the password from an ENV var here instead of using ~/.vnc/passwd
+#   -o : Specifies where to send the log output.
+#   -noipv6 : Skip trying to serve vnc on ipv6 (avoids warnings)
+#   -bg : Run in the background
+#   -forever : Don't die when the first user disconnects from vnc (which is the default)
+#   -N : Makes it use port 5900+N where N is the display.. so 5901. (default is 5900)
+echo "Launching x11vnc"
+x11vnc \
+    -display "$DISPLAY" \
+    -passwd "$VNC_PASSWORD" \
+    -o /dev/stderr \
+    -noipv6 \
+    -bg \
+    -forever \
+    -N
+
+# Launching whatever the additional command is
+echo "Launching $@"
+"$@"

.dockerignore

@@ -0,0 +1,2 @@
+docs
+.git

Dockerfile

@@ -0,0 +1,68 @@
+# Based on Frank Carey's pull request
+# https://github.com/deepmind/lab/pull/24
+
+FROM l.gcr.io/google/bazel:latest
+
+# Temporarily shut up warnings.
+ENV DISPLAY :0
+ENV TERM xterm
+
+# Basic Dependencies
+RUN apt-get update && apt-get install -y \
+    curl \
+    zip \
+    unzip \
+    software-properties-common \
+    python-software-properties && \
+  apt-get clean && \
+  rm -rf /var/lib/apt/lists/*
+
+# Dependencies for vnc setup.
+RUN apt-get update && apt-get install -y \
+    xvfb \
+    fluxbox \
+    x11vnc && \
+  apt-get clean && \
+  rm -rf /var/lib/apt/lists/*
+
+# Install deepmind-lab dependencies
+RUN apt-get update && apt-get install -y \
+    lua5.1 \
+    liblua5.1-0-dev \
+    libffi-dev \
+    gettext \
+    freeglut3-dev \
+    libsdl2-dev \
+    libosmesa6-dev \
+    python-dev \
+    python-numpy \
+    realpath \
+    build-essential && \
+  apt-get clean && \
+  rm -rf /var/lib/apt/lists/*
+
+
+# Set the default X11 Display.
+ENV DISPLAY :1
+ENV VNC_PASSWORD=password
+ENV XVFB_RESOLUTION=800x600x16
+
+# Set up deepmind-lab folder and copy in the code.
+ENV lab_dir /lab
+RUN mkdir /$lab_dir
+COPY . /$lab_dir
+WORKDIR $lab_dir
+
+# Run an actual (headless) build since this should make subsequent builds much faster.
+RUN bazel build -c opt //:deepmind_lab.so --define headless=osmesa && \ 
+    bazel test -c opt //python/tests:python_module_test
+
+# This port is the default for connecting to VNC display :1
+EXPOSE 5901
+
+# Copy VNC script that handles restarts and make it executable.
+COPY ./.docker/startup.sh /opt/
+RUN chmod u+x /opt/startup.sh
+
+# Finally, start VNC using our script.
+ENTRYPOINT ["/opt/startup.sh"]