Drop support for ubuntu-20.04 [skip ci]

Author: shivammathur

.github/ISSUE_TEMPLATE/bug.yml

@@ -42,7 +42,7 @@ body:
     id: operating-systems
     attributes:
       label: "Operating systems"
-      placeholder: "e.g., Ubuntu 20.04, Windows Server 2019, etc."
+      placeholder: "e.g., Ubuntu 22.04, Windows Server 2022, etc."
     validations:
       required: true
 

.github/workflows/docs.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        operating-system: [ubuntu-24.04, ubuntu-22.04, ubuntu-20.04, windows-2022, macos-13]
+        operating-system: [ubuntu-24.04, ubuntu-22.04, windows-2022, macos-13]
         php-versions: ['5.3', '5.4', '5.5', '5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3', '8.4', '8.5']
     steps:
       - name: Setup PHP
@@ -114,7 +114,7 @@ jobs:
           git config --local user.name "${{ github.repository_owner }}"
       - name: Combine
         run: |
-          for os in ubuntu-24.04 ubuntu-22.04 ubuntu-20.04 windows-2022 windows-2019 macos-13 macos-14 macos-15; do
+          for os in ubuntu-24.04 ubuntu-22.04 windows-2022 windows-2019 macos-13 macos-14 macos-15; do
             echo "These are extensions which are loaded by default on the following PHP versions. More extensions which are available as packages and available on pecl are supported by setup-php. Refer to [php extension support](https://github.com/shivammathur/setup-php#heavy_plus_sign-php-extension-support) for more details." > Php-extensions-loaded-on-"$os".md
             for version in 5.3 5.4 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1 8.2 8.3 8.4 8.5; do
               if [[ "${os%-*}" = "macos" ]]; then

.github/workflows/php.yml

@@ -28,7 +28,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        operating-system: [ubuntu-24.04, ubuntu-22.04, ubuntu-20.04, windows-2022, macos-13]
+        operating-system: [ubuntu-24.04, ubuntu-22.04, windows-2022, macos-13]
         php-versions: ['5.3', '5.4', '5.5', '5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3', '8.4', '8.5']
         include:
           - operating-system: ubuntu-24.04

README.md

@@ -72,7 +72,6 @@ Both `GitHub-hosted` and `self-hosted` runners are supported by `setup-php` on t
 |---------------------|---------|------------------------------------|------------------------|
 | Ubuntu 24.04        | x86_64  | `ubuntu-latest` or `ubuntu-24.04`  | `PHP 8.3`              |
 | Ubuntu 22.04        | x86_64  | `ubuntu-22.04`                     | `PHP 8.1`              |
-| Ubuntu 20.04        | x86_64  | `ubuntu-20.04`                     | `PHP 7.4` to `PHP 8.3` |
 | Ubuntu 24.04        | aarch64 | `ubuntu-24.04-arm`                 | `PHP 8.3`              |
 | Ubuntu 22.04        | aarch64 | `ubuntu-22.04-arm`                 | `PHP 8.1`              |
 | Windows Server 2025 | x64     | `windows-2025`                     | `PHP 8.3`              |
@@ -88,7 +87,6 @@ Both `GitHub-hosted` and `self-hosted` runners are supported by `setup-php` on t
 |----------------------------------|----------------------------|
 | Ubuntu 24.04                     | `self-hosted` or `Linux`   |
 | Ubuntu 22.04                     | `self-hosted` or `Linux`   |
-| Ubuntu 20.04                     | `self-hosted` or `Linux`   |
 | Debian 12                        | `self-hosted` or `Linux`   |
 | Debian 11                        | `self-hosted` or `Linux`   |
 | Windows 7 and newer              | `self-hosted` or `Windows` |
@@ -722,7 +720,7 @@ jobs:
 
 Run the workflow locally with `act` using [`shivammathur/node`](https://github.com/shivammathur/node-docker "Docker image to run setup-php") docker images.
 
-Choose the image tag which matches the `runs-on` property in your workflow. For example, if you are using `ubuntu-20.04` in your workflow, run `act -P ubuntu-20.04=shivammathur/node:2004`.
+Choose the image tag which matches the `runs-on` property in your workflow. For example, if you are using `ubuntu-22.04` in your workflow, run `act -P ubuntu-22.04=shivammathur/node:2204`.
 
 ```bash
 # For runs-on: ubuntu-latest
@@ -733,9 +731,6 @@ act -P ubuntu-24.04=shivammathur/node:2404
 
 # For runs-on: ubuntu-22.04
 act -P ubuntu-22.04=shivammathur/node:2204
-
-# For runs-on: ubuntu-20.04
-act -P ubuntu-20.04=shivammathur/node:2004
 ```
 
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