fix: remove opcache templates for PHP 8.5 (built-in extension)

Starting with PHP 8.5, opcache is compiled directly into the PHP binary
and cannot be installed as a separate extension. The docker-php-ext-install
command fails when attempting to install opcache on PHP 8.5 because the
extension build system no longer produces installable modules.

Changes:
- Remove 8.5/trixie/opcache and 8.5/alpine3.22/opcache directories
- Mark opcache as unavailable (✗¹) for PHP 8.5 in README
- Add footnote explaining opcache is built-in to PHP 8.5
- Keep opcache templates for PHP 8.1-8.4 (still functional)

Opcache is already available in all PHP 8.5 base images without
requiring any installation steps.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: fox91

8.5/alpine3.22/opcache/Dockerfile

@@ -42,7 +42,7 @@ Extension | PHP `8.1` `trixie` | PHP `8.1` `alpine3.22` | PHP `8.2` `trixie` | P
 [`mongodb`](https://pecl.php.net/package/mongodb) _PECL_ | `(2.1.4)` [:whale:](8.1/trixie/pecl_mongodb/Dockerfile) | `(2.1.4)` [:whale:](8.1/alpine3.22/pecl_mongodb/Dockerfile) | `(2.1.4)` [:whale:](8.2/trixie/pecl_mongodb/Dockerfile) | `(2.1.4)` [:whale:](8.2/alpine3.22/pecl_mongodb/Dockerfile) | `(2.1.4)` [:whale:](8.3/trixie/pecl_mongodb/Dockerfile) | `(2.1.4)` [:whale:](8.3/alpine3.22/pecl_mongodb/Dockerfile) | `(2.1.4)` [:whale:](8.4/trixie/pecl_mongodb/Dockerfile) | `(2.1.4)` [:whale:](8.4/alpine3.22/pecl_mongodb/Dockerfile) | `(2.1.4)` [:whale:](8.5/trixie/pecl_mongodb/Dockerfile) | `(2.1.4)` [:whale:](8.5/alpine3.22/pecl_mongodb/Dockerfile)
 [`mysqli`](https://php.net/mysqli) | [:whale:](8.1/trixie/mysqli/Dockerfile) | [:whale:](8.1/alpine3.22/mysqli/Dockerfile) | [:whale:](8.2/trixie/mysqli/Dockerfile) | [:whale:](8.2/alpine3.22/mysqli/Dockerfile) | [:whale:](8.3/trixie/mysqli/Dockerfile) | [:whale:](8.3/alpine3.22/mysqli/Dockerfile) | [:whale:](8.4/trixie/mysqli/Dockerfile) | [:whale:](8.4/alpine3.22/mysqli/Dockerfile) | [:whale:](8.5/trixie/mysqli/Dockerfile) | [:whale:](8.5/alpine3.22/mysqli/Dockerfile)
 [`newrelic`](https://docs.newrelic.com/docs/apm/agents/php-agent/) | [:whale:](8.1/trixie/newrelic/Dockerfile) | [:whale:](8.1/alpine3.22/newrelic/Dockerfile) | [:whale:](8.2/trixie/newrelic/Dockerfile) | [:whale:](8.2/alpine3.22/newrelic/Dockerfile) | [:whale:](8.3/trixie/newrelic/Dockerfile) | [:whale:](8.3/alpine3.22/newrelic/Dockerfile) | ✗ | ✗ | ✗ | ✗
-[`opcache`](https://php.net/opcache) | [:whale:](8.1/trixie/opcache/Dockerfile) | [:whale:](8.1/alpine3.22/opcache/Dockerfile) | [:whale:](8.2/trixie/opcache/Dockerfile) | [:whale:](8.2/alpine3.22/opcache/Dockerfile) | [:whale:](8.3/trixie/opcache/Dockerfile) | [:whale:](8.3/alpine3.22/opcache/Dockerfile) | [:whale:](8.4/trixie/opcache/Dockerfile) | [:whale:](8.4/alpine3.22/opcache/Dockerfile) | [:whale:](8.5/trixie/opcache/Dockerfile) | [:whale:](8.5/alpine3.22/opcache/Dockerfile)
+[`opcache`](https://php.net/opcache) | [:whale:](8.1/trixie/opcache/Dockerfile) | [:whale:](8.1/alpine3.22/opcache/Dockerfile) | [:whale:](8.2/trixie/opcache/Dockerfile) | [:whale:](8.2/alpine3.22/opcache/Dockerfile) | [:whale:](8.3/trixie/opcache/Dockerfile) | [:whale:](8.3/alpine3.22/opcache/Dockerfile) | [:whale:](8.4/trixie/opcache/Dockerfile) | [:whale:](8.4/alpine3.22/opcache/Dockerfile) | ✗¹ | ✗¹
 [`pcntl`](https://php.net/pcntl) | [:whale:](8.1/trixie/pcntl/Dockerfile) | [:whale:](8.1/alpine3.22/pcntl/Dockerfile) | [:whale:](8.2/trixie/pcntl/Dockerfile) | [:whale:](8.2/alpine3.22/pcntl/Dockerfile) | [:whale:](8.3/trixie/pcntl/Dockerfile) | [:whale:](8.3/alpine3.22/pcntl/Dockerfile) | [:whale:](8.4/trixie/pcntl/Dockerfile) | [:whale:](8.4/alpine3.22/pcntl/Dockerfile) | [:whale:](8.5/trixie/pcntl/Dockerfile) | [:whale:](8.5/alpine3.22/pcntl/Dockerfile)
 [`pdo_mysql`](https://php.net/pdo_mysql) | [:whale:](8.1/trixie/pdo_mysql/Dockerfile) | [:whale:](8.1/alpine3.22/pdo_mysql/Dockerfile) | [:whale:](8.2/trixie/pdo_mysql/Dockerfile) | [:whale:](8.2/alpine3.22/pdo_mysql/Dockerfile) | [:whale:](8.3/trixie/pdo_mysql/Dockerfile) | [:whale:](8.3/alpine3.22/pdo_mysql/Dockerfile) | [:whale:](8.4/trixie/pdo_mysql/Dockerfile) | [:whale:](8.4/alpine3.22/pdo_mysql/Dockerfile) | [:whale:](8.5/trixie/pdo_mysql/Dockerfile) | [:whale:](8.5/alpine3.22/pdo_mysql/Dockerfile)
 [`pdo_pgsql`](https://php.net/pdo_pgsql) | [:whale:](8.1/trixie/pdo_pgsql/Dockerfile) | [:whale:](8.1/alpine3.22/pdo_pgsql/Dockerfile) | [:whale:](8.2/trixie/pdo_pgsql/Dockerfile) | [:whale:](8.2/alpine3.22/pdo_pgsql/Dockerfile) | [:whale:](8.3/trixie/pdo_pgsql/Dockerfile) | [:whale:](8.3/alpine3.22/pdo_pgsql/Dockerfile) | [:whale:](8.4/trixie/pdo_pgsql/Dockerfile) | [:whale:](8.4/alpine3.22/pdo_pgsql/Dockerfile) | [:whale:](8.5/trixie/pdo_pgsql/Dockerfile) | [:whale:](8.5/alpine3.22/pdo_pgsql/Dockerfile)
@@ -62,3 +62,7 @@ Extension | PHP `8.1` `trixie` | PHP `8.1` `alpine3.22` | PHP `8.2` `trixie` | P
 [`zip`](https://pecl.php.net/package/zip) _PECL_ | `(1.22.7)` [:whale:](8.1/trixie/pecl_zip/Dockerfile) | `(1.22.7)` [:whale:](8.1/alpine3.22/pecl_zip/Dockerfile) | `(1.22.7)` [:whale:](8.2/trixie/pecl_zip/Dockerfile) | `(1.22.7)` [:whale:](8.2/alpine3.22/pecl_zip/Dockerfile) | `(1.22.7)` [:whale:](8.3/trixie/pecl_zip/Dockerfile) | `(1.22.7)` [:whale:](8.3/alpine3.22/pecl_zip/Dockerfile) | `(1.22.7)` [:whale:](8.4/trixie/pecl_zip/Dockerfile) | `(1.22.7)` [:whale:](8.4/alpine3.22/pecl_zip/Dockerfile) | `(1.22.7)` [:whale:](8.5/trixie/pecl_zip/Dockerfile) | `(1.22.7)` [:whale:](8.5/alpine3.22/pecl_zip/Dockerfile)
 [`zip`](https://php.net/zip) | [:whale:](8.1/trixie/zip/Dockerfile) | [:whale:](8.1/alpine3.22/zip/Dockerfile) | [:whale:](8.2/trixie/zip/Dockerfile) | [:whale:](8.2/alpine3.22/zip/Dockerfile) | [:whale:](8.3/trixie/zip/Dockerfile) | [:whale:](8.3/alpine3.22/zip/Dockerfile) | [:whale:](8.4/trixie/zip/Dockerfile) | [:whale:](8.4/alpine3.22/zip/Dockerfile) | [:whale:](8.5/trixie/zip/Dockerfile) | [:whale:](8.5/alpine3.22/zip/Dockerfile)
 [`zstd`](https://pecl.php.net/package/zstd) _PECL_ | `(0.15.2)` [:whale:](8.1/trixie/pecl_zstd/Dockerfile) | `(0.15.2)` [:whale:](8.1/alpine3.22/pecl_zstd/Dockerfile) | `(0.15.2)` [:whale:](8.2/trixie/pecl_zstd/Dockerfile) | `(0.15.2)` [:whale:](8.2/alpine3.22/pecl_zstd/Dockerfile) | `(0.15.2)` [:whale:](8.3/trixie/pecl_zstd/Dockerfile) | `(0.15.2)` [:whale:](8.3/alpine3.22/pecl_zstd/Dockerfile) | `(0.15.2)` [:whale:](8.4/trixie/pecl_zstd/Dockerfile) | `(0.15.2)` [:whale:](8.4/alpine3.22/pecl_zstd/Dockerfile) | `(0.15.2)` [:whale:](8.5/trixie/pecl_zstd/Dockerfile) | `(0.15.2)` [:whale:](8.5/alpine3.22/pecl_zstd/Dockerfile)
+
+## Notes
+
+**¹ opcache**: Starting with PHP 8.5, opcache is built directly into the PHP binary and cannot be installed as a separate extension. It is already available in all PHP 8.5 base images without requiring installation.