Add softlinks to stdout/stderror logs

Dockerfile

@@ -15,6 +15,7 @@ RUN mkdir -p /var/lib/nginx/body && \
     
 # Logging to stdout
 RUN ln -sf /proc/self/fd /dev/
+RUN ln -sf /dev/stdout /var/log/nginx/access.log && ln -sf /dev/stderr /var/log/nginx/error.log
 
 # PID nginx for non-root users
 RUN mkdir -p /run/nginx && \