Build php 8.5 image

[HageMaster3108]

PHP 8.5 has been around for a while now, probably best to be prepared to migrate there by having a docker baseimage ready ;-)

Admittedly, couldn't test the GH workflow because this would've required modifying the workflow definition in my fork repo, but I did validate whether the build works as per below.

Re the opcode module change:
https://stackoverflow.com/questions/79826535/docker-php-ext-install-opcache-works-with-php-8-4-but-not-php-8-5

---

Testing performed

Validated locally that the PHP 8.5 image builds and that all bundled
extensions compile against PHP 8.5, before relying on CI.

Environment

• Docker 29.3.1, Buildx/BuildKit v0.28.1
• Host: macOS / Apple Silicon → built linux/arm64 natively (no QEMU)
• Base image: php:8.5-fpm-bookworm (PHP 8.5.6, built 2026-05-19)

Build

The debug target chains min → default → debug, so building it
exercises every version-sensitive step in one pass (all docker-php-ext-install
extensions plus the PECL extensions amqp, apcu, imagick, redis, xdebug):

    --platform linux/arm64 \
    --target opendxp_php_debug \
    --build-arg PHP_VERSION=8.5 \
    --build-arg DEBIAN_VERSION=bookworm \
    -t opendxp85:debug .

Result: build succeeds (exit 0). Extensions compiled on 8.5.6:
amqp-2.2.0, apcu-5.1.28, imagick-3.8.1, redis-6.3.0, xdebug-3.5.1.

Smoke checks (mirroring .github/workflows/test.yml):

  docker run --rm opendxp85:debug php -v
  # → PHP 8.5.6, with Xdebug v3.5.1, with Zend OPcache v8.5.6

  docker run --rm opendxp85:debug sh -c 'php -m | grep -i imagick'   # imagick
  docker run --rm opendxp85:debug sh -c 'php -m | grep -i xdebug'    # xdebug
  docker run --rm opendxp85:debug \
    test -f /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini      # present
  docker run --rm opendxp85:debug \
    php -r 'exit(extension_loaded("Zend OPcache") ? 0 : 1);'         # OPcache active

Note — required fix: as of PHP 8.5, OPcache is compiled statically into
the PHP core, so docker-php-ext-install opcache fails with
cp: cannot stat 'modules/*': No such file or directory
(see docker-library/php#1631, php-src#20557). This PR version-gates the
opcache install (PHP_VERSION_ID < 80500), leaving 8.2–8.4 unchanged.

[scrummer]

@HageMaster3108 Thank you very much

I just needed to fix/update some workflow definitions. Can you update your PR? Then we are happy to merge it :)