reduce image size by setting permissions at copy stage

.dockerignore

@@ -8,10 +8,6 @@ Dockerfile
 dockerfiles/LICENSE
 dockerfiles/README.md
 docs
-install/pialert_install.sh
-install/pialert_install_no_webserver.sh
-install/pialert_uninstall.sh
-install/pialert_update.sh
 LICENSE.txt
 README.md
-tar
+CONTRIBUTING

Dockerfile

@@ -16,17 +16,19 @@ RUN apt-get update \
     && rm -rf /var/www/html \
     && ln -s /home/pi/pialert/front /var/www/html 
 
-   
+# create pi user and group
-# now creating user
+# add root and www-data to pi group so they can r/w files and db
 RUN groupadd --gid "${USER_GID}" "${USER}" && \
     useradd \
         --uid ${USER_ID} \
         --gid ${USER_GID} \
         --create-home \
         --shell /bin/bash \
-      ${USER}
+        ${USER} && \
+    usermod -a -G ${USER_GID} root && \
+    usermod -a -G ${USER_GID} www-data
 
-COPY . /home/pi/pialert
+COPY --chmod=775 --chown=${USER_ID}:${USER_GID} . /home/pi/pialert/
 
 # Pi.Alert
 RUN rm /etc/nginx/sites-available/default \
@@ -35,7 +37,4 @@ RUN rm /etc/nginx/sites-available/default \
     # run the hardware vendors update
     && /home/pi/pialert/back/update_vendors.sh 
 
-# it's easy for permissions set in Git to be overridden, so doing it manually
-RUN chmod -R a+rxw /home/pi/pialert/
-
 CMD ["/home/pi/pialert/dockerfiles/start.sh"]