make use of preinstalled variable

roles/jitsimeet/tasks/prepare_system.yml

@@ -6,27 +6,29 @@
       DefaultLimitNPROC=65000
       DefaultTasksMax=65000
 
-- name: jitsimeet | reload systemd
+- block
-  systemd:
+  - name: jitsimeet | reload systemd
-    daemon_reload: true
+    systemd:
+      daemon_reload: true
 
-- name: jitsimeet | import GPG key
+  - name: jitsimeet | import GPG key
-  apt_key:
+    apt_key:
-    url: "https://download.jitsi.org/jitsi-key.gpg.key"
+      url: "https://download.jitsi.org/jitsi-key.gpg.key"
-    state: present # not required. choices: absent;present. Ensures that the key is present (added) or absent (revoked).
+      state: present # not required. choices: absent;present. Ensures that the key is present (added) or absent (revoked).
 
-- name: jitsimeet | add repository
+  - name: jitsimeet | add repository
-  lineinfile:
+    lineinfile:
-    path: "/etc/apt/sources.list.d/jitsi-stable.list"
+      path: "/etc/apt/sources.list.d/jitsi-stable.list"
-    line: "deb https://download.jitsi.org stable/"
+      line: "deb https://download.jitsi.org stable/"
-    create: True
+      create: True
-    backup: True
+      backup: True
-  notify: apt_update
+    notify: apt_update
 
-- name: jitsimeet | flush handlers
+  - name: jitsimeet | flush handlers
-  meta: flush_handlers
+    meta: flush_handlers
 
-- name: jitsimeet | add debconf-utils package
+  - name: jitsimeet | add debconf-utils package
-  package:
+    package:
-    name: debconf-utils
+      name: debconf-utils
-    state: latest
+      state: latest
+  when: preinstalled == false or preinstalled is not defined