remove ubuntu-focal platform from molecule default platforms

Ubuntu 20.04 LTS (Focal Fossa) is out of standard support on 31 May
2025.

Author: nemca

.config/molecule/config.yml

@@ -154,14 +154,6 @@ platforms:
     volumes:
       - /sys/fs/cgroup:/sys/fs/cgroup:rw
     command: /usr/sbin/init
-  - name: ubuntu-focal
-    image: ubuntu:focal
-    dockerfile: ../common/Dockerfile.j2
-    privileged: true
-    cgroupns_mode: host
-    volumes:
-      - /sys/fs/cgroup:/sys/fs/cgroup:rw
-    command: /sbin/init
   - name: ubuntu-jammy
     image: ubuntu:jammy
     dockerfile: ../common/Dockerfile.j2

README.md

@@ -196,7 +196,6 @@ Rocky Linux:
 SUSE/SLES:
   - 15 SP6+
 Ubuntu:
-  - focal (20.04)
   - jammy (22.04)
   - noble (24.04)
 ```

vars/main.yml

@@ -59,8 +59,8 @@ nginx_supported_distributions:
     architectures: [x86_64]
   ubuntu:
     name: Ubuntu
-    architectures: "{{ ['x86_64', 'aarch64', 's390x'] if ((ansible_facts['distribution_version'] is version('20.04', '==')) or (ansible_facts['distribution_version'] is version('22.04', '=='))) else ['x86_64', 'aarch64'] }}"
-    versions: [20.04, 22.04, 24.04]
+    versions: [22.04, 24.04]
+    architectures: "{{ ['x86_64', 'aarch64', 's390x'] if (ansible_facts['distribution_version'] is version('22.04', '==')) else ['x86_64', 'aarch64'] }}"
 
 # Supported NGINX Plus distributions
 # https://docs.nginx.com/nginx/technical-specs/