fix: healthcheck

Part-of: <http://gitlab.vnc.biz/uxf/vnctalk-prosody/-/merge_requests/1>

config/healthcheck.sh

@@ -7,7 +7,7 @@
 #is running and healthy by checking if the TCP port 5582 is open and responsive.
 
 if [ -f /etc/tls-update/tls.crt ]; then
-  OLDHASH=$(md5sum /etc/prosody/prosody-ssl.pem | awk '{print $1}')
+  OLDHASH=$(md5sum /etc/prosody/certs/prosody-ssl.pem | awk '{print $1}')
   NEWHASH=$(md5sum /etc/tls-update/tls.crt | awk '{print $1}')
   if [ "x$OLDHASH" != "x$NEWHASH" ]; then
     # cert in secret is changed - fail healthcheck to restart with new cert