add google, tweak to be a bit more robust

Dockerfile

@@ -1,29 +1,28 @@
-FROM python
+FROM python:latest
 WORKDIR /code
-COPY . .
 
 # declare var
 ARG ENV
 ARG BOOK_UID
 ARG BOOK_GID
 
-RUN groupadd -g ${BOOK_GID} pybook && useradd -m -u ${BOOK_UID} -g ${BOOK_GID} pybook
-# in prod, /code will be owned by root and gunicorn logs wont work, so chg to pybook
-RUN if [ "$ENV" = "production" ]; then \
-        chown -R pybook:pybook /code; \
-    fi
+RUN apt-get update && apt-get install -y sudo && apt-get -y upgrade 
 
-RUN wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb
-RUN apt-get update && \
+RUN wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb && \
     apt-get install -y ./google-chrome-stable_current_amd64.deb && \
     apt-get install -f -y && \
-    apt-get install sudo && \
-    apt-get upgrade -y && \
-    rm ./google-chrome-stable_current_amd64.deb && \
+    rm -f ./google-chrome-stable_current_amd64.deb && \
     apt-get clean
 
-RUN pip3 install --upgrade pip
-RUN pip3 install -U -r requirements.txt
+# just copy requirements for now, helps with build optimisation
+COPY requirements.txt .
+RUN pip3 install --upgrade pip && pip3 install -r requirements.txt
+
+RUN groupadd -g ${BOOK_GID} pybook && useradd -m -u ${BOOK_UID} -g ${BOOK_GID} pybook
+
+COPY . .
+# in prod, /code will be owned by root and gunicorn logs wont work, so chg to pybook
+RUN chown -R pybook:pybook /code
 RUN cat /dev/urandom | head -c 50 | md5sum | head -c 32 > /code/.sk
 RUN chmod 600 .sk
 EXPOSE 80