Manually update Nextcloud (docker) to the latest version

Nextcloud_update.sh

cd /AppData/nextcloud

# Download latest version
sudo wget https://download.nextcloud.com/server/releases/nextcloud-<VERSION>.zip -O /AppData/nextcloud/nextcloud.zip 
sudo unzip /AppData/nextcloud/nextcloud.zip

# Stopping container
docker stop nextcloud-app-1

# Backup old files, move apps and old configurations.
sudo mv /AppData/nextcloud/html /AppData/nextcloud/html_bak
sudo mv /AppData/nextcloud/nextcloud /AppData/nextcloud/html
sudo cp /AppData/nextcloud/html_bak/config/config.php /AppData/nextcloud/html/config/config.php
sudo mv /AppData/nextcloud/html_bak/custom_apps/ /AppData/nextcloud/html/

# Permission Fixes
sudo chown -R www-data:www-data html
sudo chmod -R 770 html

# Restarting container
docker start nextcloud-app-1

# Initiate Nextcloud updgrade
docker exec -it -u www-data nextcloud-app-1 php ./occ upgrade
docker exec -it -u www-data nextcloud-app-1 php ./occ db:add-missing-indices

# Remove old files
sudo rm -r /AppData/nextcloud/html_bak
sudo rm /AppData/nextcloud/nextcloud.zip