Adds check to skip generate certs if they already exists on update.

debian/jitsi-meet.postinst

@@ -34,16 +34,14 @@ case "$1" in
             sed -i "s/#\ server_names_hash_bucket_size\ 64/\ server_names_hash_bucket_size\ 64/" /etc/nginx/nginx.conf
         fi
 
+        if [ ! -f /etc/ssl/$JVB_HOSTNAME.key] || [ ! -f /etc/ssl/$JVB_HOSTNAME.crt]; then
             # loading debconf
             . /usr/share/debconf/confmodule
 
             # SSL for nginx
             db_get jitsi-meet/cert-choice
             CERT_CHOICE="$RET"
-        if [ "$CERT_CHOICE" = 'I want a generated self-signed certificate' ]; then
-            # self-signed certificate is already in place for prosody
-            :
-        elif [ "$CERT_CHOICE" = 'I have a certificate and will upload the files on the server' ]; then
+            if [ "$CERT_CHOICE" = 'I have a certificate and will upload the files on the server' ]; then
                 db_set jitsi-meet/cert-path-key "/etc/ssl/$JVB_HOSTNAME.key"
                 db_input critical jitsi-meet/cert-path-key || true
                 db_go
@@ -64,6 +62,7 @@ case "$1" in
                 sed -i "s/ssl_certificate\ \/var\/lib\/prosody\/.*crt/ssl_certificate\ $CERT_CRT_ESC/g" \
                     /etc/nginx/sites-available/$JVB_HOSTNAME.conf
             fi
+        fi
 
         # and we're done with debconf
         db_stop