introduced preinstalled variable

roles/jitsimeet/tasks/install_jitsimeet.yml

@@ -16,20 +16,22 @@
 # - jitsi-meet-web-config
 # - jitsi-videobridge2
 
-- name: jitsimeet | set debconf vars
-  shell:
-    cmd: "{{ playbook_dir }}/roles/jitsimeet/files/set_debconf.sh {{ jitsi_fqdn }}"
+- block
+  - name: jitsimeet | set debconf vars
+    shell:
+      cmd: "{{ playbook_dir }}/roles/jitsimeet/files/set_debconf.sh {{ jitsi_fqdn }}"
 
-- name: jitsimeet | install packages
-  package:
-    name: 
-      - prosody
-      - jicofo
-      - jitsi-meet-web
-      - jitsi-meet-prosody
-      - jitsi-meet-web-config
-      - jitsi-videobridge2
-  notify: restart_nginx
+  - name: jitsimeet | install packages
+    package:
+      name: 
+        - prosody
+        - jicofo
+        - jitsi-meet-web
+        - jitsi-meet-prosody
+        - jitsi-meet-web-config
+        - jitsi-videobridge2
+    notify: restart_nginx
+  when: preinstalled == false or preinstalled is not defined
 
 - name: jitsimeet | copy custom settings
   copy: