also allow digits

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

Containers/mastercontainer/start.sh

@@ -186,17 +186,17 @@ It is set to '$NEXTCLOUD_STARTUP_APPS'."
     fi
 fi
 if [ -n "$NEXTCLOUD_ADDITIONAL_APKS" ]; then
-    if ! echo "$NEXTCLOUD_ADDITIONAL_APKS" | grep -q "^[a-z _-]\+$"; then
+    if ! echo "$NEXTCLOUD_ADDITIONAL_APKS" | grep -q "^[a-z0-9 _-.]\+$"; then
         echo "You've set NEXTCLOUD_ADDITIONAL_APKS but not to an allowed value.
-It needs to be a string. Allowed are small letters a-z, spaces, hyphens and '_'.
+It needs to be a string. Allowed are small letters a-z, digits 0-9, spaces, hyphens, dots and '_'.
 It is set to '$NEXTCLOUD_ADDITIONAL_APKS'."
         exit 1
     fi
 fi
 if [ -n "$NEXTCLOUD_ADDITIONAL_PHP_EXTENSIONS" ]; then
-    if ! echo "$NEXTCLOUD_ADDITIONAL_PHP_EXTENSIONS" | grep -q "^[a-z _-]\+$"; then
+    if ! echo "$NEXTCLOUD_ADDITIONAL_PHP_EXTENSIONS" | grep -q "^[a-z0-9 _-.]\+$"; then
         echo "You've set NEXTCLOUD_ADDITIONAL_PHP_EXTENSIONS but not to an allowed value.
-It needs to be a string. Allowed are small letters a-z, spaces, hyphens and '_'.
+It needs to be a string. Allowed are small letters a-z, digits 0-9, spaces, hyphens, dots and '_'.
 It is set to '$NEXTCLOUD_ADDITIONAL_PHP_EXTENSIONS'."
         exit 1
     fi

readme.md

@@ -470,12 +470,12 @@ You might want to adjust the Nextcloud apps that are installed upon the first st
 ### How to add packets permanently to the Nextcloud container?
 Some Nextcloud apps require additional external dependencies that must be bundled within Nextcloud container in order to work correctly. As we cannot put each and every dependency for all apps into the container - as this would make the project very fast unmaintainable - there is an official way how you can add additional dependencies into the Nextcloud container. However note that doing this is not recommended since we do not test Nextcloud apps that require external dependencies. 
 
-You can do so by adding `-e NEXTCLOUD_ADDITIONAL_APKS="imagemagick dependency2 dependency3"` to the docker run command of the mastercontainer and customize the value to your fitting. It must be a string with small letters a-z, spaces and hyphens or '_'. You can find available packages here: https://pkgs.alpinelinux.org/packages?name=&branch=v3.16&repo=&arch=&maintainer=. By default added is `imagemagick`. If you want to keep that, you need to specify it as well.
+You can do so by adding `-e NEXTCLOUD_ADDITIONAL_APKS="imagemagick dependency2 dependency3"` to the docker run command of the mastercontainer and customize the value to your fitting. It must be a string with small letters a-z, digits 0-9, spaces, dots and hyphens or '_'. You can find available packages here: https://pkgs.alpinelinux.org/packages?name=&branch=v3.16&repo=&arch=&maintainer=. By default added is `imagemagick`. If you want to keep that, you need to specify it as well.
 
 ### How to add PHP extensions permanently to the Nextcloud container?
 Some Nextcloud apps require additional php extensions that must be bundled within Nextcloud container in order to work correctly. As we cannot put each and every dependency for all apps into the container - as this would make the project very fast unmaintainable - there is an official way how you can add additional php extensions into the Nextcloud container. However note that doing this is not recommended since we do not test Nextcloud apps that require additional php extensions. 
 
-You can do so by adding `-e NEXTCLOUD_ADDITIONAL_PHP_EXTENSIONS="imagick extension1 extension2"` to the docker run command of the mastercontainer and customize the value to your fitting. It must be a string with small letters a-z, spaces and hyphens or '_'. You can find available extensions here: https://pecl.php.net/packages.php. By default added is `imagick`. If you want to keep that, you need to specify it as well.
+You can do so by adding `-e NEXTCLOUD_ADDITIONAL_PHP_EXTENSIONS="imagick extension1 extension2"` to the docker run command of the mastercontainer and customize the value to your fitting. It must be a string with small letters a-z, digits 0-9, spaces, dots and hyphens or '_'. You can find available extensions here: https://pecl.php.net/packages.php. By default added is `imagick`. If you want to keep that, you need to specify it as well.
 
 ### Huge docker logs
 When your containers run for a few days without a restart, the container logs that you can view from the AIO interface can get really huge. You can limit the loge sizes by enabling logrotate for docker container logs. Feel free to enable this by following those instructions: https://sandro-keil.de/blog/logrotate-for-docker-container/