Remove support for Ubuntu Focal

This platform is EOL as of May 2025.  See here for more details:
https://ubuntu.com/about/release-cycle

Author: jsf9k

.config/molecule/config.yml

@@ -166,24 +166,6 @@ platforms:
     privileged: true
     volumes:
       - /sys/fs/cgroup:/sys/fs/cgroup:rw
-  - cgroupns_mode: host
-    command: /lib/systemd/systemd
-    image: docker.io/geerlingguy/docker-ubuntu2004-ansible:latest
-    name: ubuntu-20-systemd-amd64
-    platform: amd64
-    pre_build_image: true
-    privileged: true
-    volumes:
-      - /sys/fs/cgroup:/sys/fs/cgroup:rw
-  - cgroupns_mode: host
-    command: /lib/systemd/systemd
-    image: docker.io/geerlingguy/docker-ubuntu2004-ansible:latest
-    name: ubuntu-20-systemd-arm64
-    platform: arm64
-    pre_build_image: true
-    privileged: true
-    volumes:
-      - /sys/fs/cgroup:/sys/fs/cgroup:rw
   - cgroupns_mode: host
     command: /lib/systemd/systemd
     image: docker.io/geerlingguy/docker-ubuntu2204-ansible:latest

.github/workflows/build.yml

@@ -225,7 +225,6 @@ jobs:
           - fedora40-systemd
           - fedora41-systemd
           - kali-systemd
-          - ubuntu-20-systemd
           - ubuntu-22-systemd
           - ubuntu-24-systemd
         scenario:

meta/main.yml

@@ -39,7 +39,6 @@ galaxy_info:
         - "2023"
     - name: Ubuntu
       versions:
-        - focal
         - jammy
         - noble
   role_name: skeleton