Does not override nginx config on update.

debian/jitsi-meet.postinst

 
         # nginx conf
         . /etc/default/jitsi-videobridge
-        cp /usr/share/doc/jitsi-meet/jitsi-meet.example /etc/nginx/sites-available/$JVB_HOSTNAME.conf
-        if [ ! -f /etc/nginx/sites-enabled/$JVB_HOSTNAME.conf ]; then
-            ln -s /etc/nginx/sites-available/$JVB_HOSTNAME.conf /etc/nginx/sites-enabled/$JVB_HOSTNAME.conf
-        fi
-        sed -i "s/jitsi-meet.example.com/$JVB_HOSTNAME/g" /etc/nginx/sites-available/$JVB_HOSTNAME.conf
-        # FIXME do we need the default?
-        if [ ! -f /etc/nginx/sites-enabled/default ]; then
-            ln -s /etc/nginx/sites-available/default /etc/nginx/sites-enabled/default
+        if [ ! -f /etc/nginx/sites-available/$JVB_HOSTNAME.conf ]; then
+            cp /usr/share/doc/jitsi-meet/jitsi-meet.example /etc/nginx/sites-available/$JVB_HOSTNAME.conf
+            if [ ! -f /etc/nginx/sites-enabled/$JVB_HOSTNAME.conf ]; then
+                ln -s /etc/nginx/sites-available/$JVB_HOSTNAME.conf /etc/nginx/sites-enabled/$JVB_HOSTNAME.conf
+            fi
+            sed -i "s/jitsi-meet.example.com/$JVB_HOSTNAME/g" /etc/nginx/sites-available/$JVB_HOSTNAME.conf
         fi
+
         if grep "# server_names_hash_bucket_size 64" /etc/nginx/nginx.conf > /dev/null; then
             sed -i "s/#\ server_names_hash_bucket_size\ 64/\ server_names_hash_bucket_size\ 64/" /etc/nginx/nginx.conf
         fi