define updaterdirectory and add forgotten exit

Signed-off-by: Simon L <szaimen@e.mail.de>

Containers/nextcloud/Dockerfile

@@ -264,6 +264,11 @@ RUN set -ex; \
 
 VOLUME /mnt/ncdata
 
+RUN set -ex; \
+    mkdir -p /nc-updater; \
+    chown -R www-data:www-data /nc-updater; \
+    chmod -R 770 /nc-updater
+
 # Give root a random password
 RUN echo "root:$(openssl rand -base64 12)" | chpasswd