Added instance deploy metrics and horizon selenium metrics

Dockerfile

@@ -1,14 +1,49 @@
 FROM python:3.8
 RUN pip install pipenv
 RUN mkdir /python
+
 ### CACHE PIP DEPENDENCIES
 COPY Pipfile* /tmp/
 RUN cd /tmp && pipenv lock --requirements > requirements.txt
 RUN pip install -r /tmp/requirements.txt
 ###
+
+### install Chromium
+RUN apt-get update
+# stretch uses chromium package not chromium-browser
+RUN apt-get install chromium=83.0* -y
+
+# install chromedriver
+RUN apt-get install -yqq unzip
+RUN wget -O /tmp/chromedriver.zip https://chromedriver.storage.googleapis.com/83.0.4103.39/chromedriver_linux64.zip
+RUN unzip /tmp/chromedriver.zip chromedriver -d /usr/local/bin/
+
+# install xvfb
+RUN apt-get install -yqq xvfb
+
+RUN apt-get -qq clean \
+  && apt-get autoremove -y \
+  && rm -rf \
+    /var/lib/apt/lists/* \
+    /tmp/* \
+    /var/tmp/*
+
+# set display port and dbus env to avoid hanging
+ENV DISPLAY=:99
+ENV DBUS_SESSION_BUS_ADDRESS=/dev/null
+
+COPY docker-entrypoint.sh /root/docker-entrypoint.sh
+
+RUN mkdir /app
+WORKDIR /app
+
+RUN chmod a+x /root/docker-entrypoint.sh
+###
+
 WORKDIR /python
 COPY . .
 
+# Python output in stdout
 ENV PYTHONUNBUFFERED=1
 ENV PYTHONIOENCODING=UTF-8
-CMD ["python", "/python/openstack_exporter.py"]
+ENTRYPOINT ["bash", "/root/docker-entrypoint.sh","python", "/python/openstack_exporter.py"]