feat(): add UPLOAD_MAX_SIZE variable

rootfs/usr/local/bin/run.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+# Set attachment size limit
+sed -i "s/<UPLOAD_MAX_SIZE>/$UPLOAD_MAX_SIZE/g" /etc/php7/php-fpm.conf /etc/nginx/nginx.conf
+
+# Fix permissions
+chown -R $UID:$GID /rainloop /services /var/log /var/lib/nginx
+
+# RUN !
+exec su-exec $UID:$GID /bin/s6-svscan /services