travis: Use Dockerfile for travis image

.travis.yml

 before_script:
-  - git fetch --unshallow || true
   - mkdir -p $HOME/roms
+git:
+  depth: false
 cache:
   - ccache
   - directories:
@@ -12,8 +13,7 @@ matrix:
       services:
         - docker
       before_install:
-        - docker login us.gcr.io -u="_json_key" -p="$GOOGLE_APPLICATION_CREDENTIALS_DATA"
-        - ( while true; do echo '.'; sleep 60; done ) & docker pull us.gcr.io/universe-162007/retro # Keep travis alive while pulling
+        - docker pull quay.io/openai/travis-build
       script:
         - >
           docker run
@@ -26,8 +26,8 @@ matrix:
           --volume /home/travis/roms:/root/roms
           --volume /home/travis/.ccache:/root/.ccache
           --workdir /root/code/retro
-          us.gcr.io/universe-162007/retro
-          bash -lc 'python travis.py'
+          quay.io/openai/travis-build
+          python travis.py
     - os: osx
       osx_image: xcode8
       before_install:
@@ -37,5 +37,6 @@ matrix:
         - hash -r
         - conda install --yes python=3.6.1
         - export PATH=/usr/local/opt/ccache/libexec:$PATH
+        - pip install wheel google-cloud pytest pytest-xdist
       script:
         - python travis.py

Dockerfile

+FROM ubuntu:xenial
+
+SHELL ["/bin/bash", "-c"]
+RUN apt-get update && \
+    DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+        build-essential ccache cmake git libffi-dev libgit2-dev libpython3-dev \
+        libzip-dev pkg-config python3-venv && \
+    apt-get clean && \
+    python3 -m venv ~/venv && \
+    . ~/venv/bin/activate && \
+    pip install wheel && \
+    pip install google-cloud google-resumable-media matplotlib pygit2==0.24.2 pytest requests && \
+    rm -r ~/.cache && \
+    echo "source /root/venv/bin/activate" > ~/.bash_profile
+
+ENTRYPOINT ["bash", "-lc", "exec $0 $@"]

travis.py

@@ -57,7 +57,6 @@ def test():
 
 
 def plot_history():
-    call(['pip', 'install', '-U', 'matplotlib', 'pygit2==0.24.2'])
     import scripts.plot_history as plot
     plot.main()
 
@@ -77,7 +76,6 @@ def main():
     with Fold('script.build', 'Building'):
         call(['cmake', '.', '-DBUILD_TESTS=ON'])
         call(['python', 'setup.py', '-q', 'build_ext', '-i', '-j3'])
-        call(['pip', 'install', 'wheel', 'google-cloud', 'pytest', 'pytest-xdist'])
         call(['pip', 'install', '-e', '.'])
         call(['make', '-j3'])