Swap Google Chrome for Chromium in Dockerfile

Dockerfile

@@ -4,11 +4,9 @@ ENV PYTHONDONTWRITEBYTECODE 1
 ENV PYTHONUNBUFFERED 1
 ARG PIP_NO_CACHE_DIR=1
 
-# Install Google Chrome
-RUN wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add -
-RUN sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google-chrome.list'
+# Install Chromium
 RUN apt-get -y update
-RUN apt-get install -y google-chrome-stable
+RUN apt-get install -y chromium
 
 # Upgrade pip, install pipenv
 RUN pip install --upgrade pip