[enh] add auto upgrade script

auto_upgrade_wekan.sh

@@ -0,0 +1,26 @@
+#! /bin/bash
+
+# Provided as an example. The script is deployed by install.sh
+
+exec & >> /var/log/auto_upgrade_wekan.log
+URL="https://releases.wekan.team/"
+NEW=$(curl -s $URL | grep -e ">wekan.*zip"|sed -r "s/^.*>wekan-(.*?).zip<.*$/\1/"| sort | tail -n 1)
+CUR=$(readlink /home/wekan/bundle| cut -d"/" -f 4)
+[ "$NEW" == "$CUR" ] && exit 0
+[ -e /home/wekan/$NEW ] && exit 0
+echo "$(date) Install $NEW"
+TMP=$( mktemp -d )
+cd "$TMP"
+wget --quiet "$URL/wekan-$NEW.zip"
+unzip "wekan-$NEW.zip" &>/dev/null
+mv bundle "/home/wekan/$NEW"
+cd "/home/wekan/$NEW/programs/server"
+npm uninstall fibers
+npm install fibers
+chown -R wekan:wekan "/home/wekan/$NEW"
+rm -rf "$TMP"
+rm -f "/home/wekan/bundle"
+ln -s "/home/wekan/$NEW" "/home/wekan/bundle"
+supervisorctl restart wekan
+echo "$(date) Restarted"
+