move plex chown operation, and change test for it

root/etc/cont-init.d/40-chown-files

@@ -0,0 +1,23 @@
+#!/usr/bin/with-contenv bash
+
+# check for preferences file, make lock file if not found and exit out
+if [ ! -e "/config/Library/Application Support/Plex Media Server/Preferences.xml" ]; then
+mkdir -p /config/Library
+touch /config/Library/linuxserver-chown.lock
+chown abc:abc \
+	/config/Library
+chown abc:abc \
+	/config/Library/linuxserver-chown.lock
+exit 0
+fi
+
+if [ ! -f "/config/Library/linuxserver-chown.lock" ]; then
+echo "Possible migration from existing version detected, please be patient while we chown existing files"
+echo "This could take some time"
+chown abc:abc -R \
+	/config/Library
+touch /config/Library/linuxserver-chown.lock
+chown abc:abc \
+	/config/Library/linuxserver-chown.lock
+echo "chown operation completed"
+fi