Drop support for Ubuntu 20.04

Author: shivammathur

.github/workflows/ci.yml

@@ -20,14 +20,14 @@ on:
         required: false
       container-os-versions:
         description: 'OS versions to build on'
-        default: 'ubuntu:20.04 ubuntu:22.04 ubuntu:24.04 arm64v8/ubuntu:22.04 arm64v8/ubuntu:24.04 debian:11 debian:12'
+        default: 'ubuntu:22.04 ubuntu:24.04 arm64v8/ubuntu:22.04 arm64v8/ubuntu:24.04 debian:11 debian:12'
         required: false
   schedule:
     - cron: '0 0 1-31/2 * *'
 
 env:
-  CONTAINER_OS_LIST: ubuntu:20.04 ubuntu:22.04 ubuntu:24.04 arm64v8/ubuntu:22.04 arm64v8/ubuntu:24.04 debian:11 debian:12
-  RUNNER_OS_LIST: ubuntu-20.04 ubuntu-22.04 ubuntu-24.04 ubuntu-22.04-arm ubuntu-24.04-arm
+  CONTAINER_OS_LIST: ubuntu:22.04 ubuntu:24.04 arm64v8/ubuntu:22.04 arm64v8/ubuntu:24.04 debian:11 debian:12
+  RUNNER_OS_LIST: ubuntu-22.04 ubuntu-24.04 ubuntu-22.04-arm ubuntu-24.04-arm
   PHP_LIST: 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1 8.2 8.3 8.4 8.5
   SAPI_LIST: apache2 cgi cli embed fpm phpdbg
   BUILD_LIST: nts zts

README.md

@@ -23,7 +23,6 @@
 
 ## OS Support
 
-- Ubuntu 20.04 (Focal) amd64
 - Ubuntu 22.04 (Jammy) amd64
 - Ubuntu 24.04 (Noble) amd64
 - Debian 11 (Bullseye) amd64