Add Dockerfile, gitlab-ci

Dockerfile

@@ -10,8 +10,6 @@ FROM python:3
 RUN apt-get update && apt-get upgrade -y && apt-get install \
   -y --no-install-recommends python3
 
-ENV PATH /env/bin:$PATH
-
 # Install pip dependencies
 ADD requirements.txt /app/requirements.txt
 RUN pip install --default-timeout=100 --upgrade pip && pip install -r /app/requirements.txt