Change nginx container to unprivileged (#525)

web/Dockerfile

@@ -1,17 +1,38 @@
-FROM nginx:mainline-alpine
+FROM nginxinc/nginx-unprivileged:mainline-alpine
+
+USER root
 
 # Remove default configuration and add our custom Nginx configuration files
 RUN rm /etc/nginx/conf.d/default.conf \
     && apk add --no-cache curl
 
 COPY ["./mattermost", "./mattermost-ssl", "/etc/nginx/sites-available/"]
-COPY ./security.conf /etc/nginx/conf.d/
 
 # Add and setup entrypoint
 COPY entrypoint.sh /
 
+RUN chown -R nginx:nginx /etc/nginx/sites-available && \
+         chown -R nginx:nginx /var/cache/nginx && \
+         chown -R nginx:nginx /var/log/nginx && \
+         chown -R nginx:nginx /etc/nginx/conf.d && \
+         chown nginx:nginx entrypoint.sh
+RUN touch /var/run/nginx.pid && \
+         chown -R nginx:nginx /var/run/nginx.pid
+
+COPY ./security.conf /etc/nginx/conf.d/
+
+RUN chown -R nginx:nginx /etc/nginx/conf.d/security.conf
+
+RUN chmod u+x /entrypoint.sh
+
+RUN sed -i "/^http {/a \    proxy_buffering off;\n" /etc/nginx/nginx.conf
+RUN sed -i '/temp_path/d' /etc/nginx/nginx.conf \
+    && sed -i 's!/tmp/nginx.pid!/var/run/nginx.pid!g' /etc/nginx/nginx.conf
+
+USER nginx
+
 #Healthcheck to make sure container is ready
-HEALTHCHECK CMD curl --fail http://localhost:80 || exit 1
+HEALTHCHECK CMD curl --fail http://localhost:8080 || exit 1
 
 ENTRYPOINT ["/entrypoint.sh"]