fix: CI/CD - brain err - not defined to is undefined

Author: BrutalBirdie

tasks/check-vars.yml

@@ -9,7 +9,7 @@
 
 - name: Check core variables
   when:
-    - bbb_github_ci not defined
+    - bbb_github_ci is undefined
   ansible.builtin.assert:
     quiet: true
     that: "{{ item }}"
@@ -25,7 +25,7 @@
 - name: Check IPv4 variables
   when:
     - bbb_bind_ip4 or bbb_public_ip4
-    - bbb_github_ci not defined
+    - bbb_github_ci is undefined
   ansible.builtin.assert:
     quiet: true
     that: "{{ item }}"
@@ -37,7 +37,7 @@
 - name: Check IPv6 variables
   when:
     - bbb_bind_ip6 or bbb_public_ip6
-    - bbb_github_ci not defined
+    - bbb_github_ci is undefined
   ansible.builtin.assert:
     quiet: true
     that: "{{ item }}"