Update Dockerfile

Corrects permissions for s6 v3

spotweb/Dockerfile

@@ -88,6 +88,9 @@ RUN apk -U update && \
 # Add rootfs
 COPY rootfs/ /
 
+# Corrects permissions for /app directory
+RUN if [ -d /app ]; then chown -R nginx /app; fi 
+
 # Corrects permissions for s6 v3
 RUN if [ -d /etc/cont-init.d ]; then chmod -R 755 /etc/cont-init.d; fi && \
     if [ -d /etc/services.d ]; then chmod -R 755 /etc/services.d; fi && \