Add PHP 8.5 support (#986)

* Use Imagick 3.8.1
* Remove `docker-php-ext-enable opcache` line

Author: swissspidy

Dockerfile.template

@@ -88,7 +88,7 @@ RUN set -ex; \
 # WARNING: imagick is likely not supported on Alpine: https://github.com/Imagick/imagick/issues/328
 {{ ) else "" end -}}
 # https://pecl.php.net/package/imagick
-	pecl install imagick-3.8.0; \
+	pecl install imagick-3.8.1; \
 	docker-php-ext-enable imagick; \
 	rm -r /tmp/pear; \
 	\
@@ -134,7 +134,6 @@ RUN set -ex; \
 {{ if env.version != "cli" then ( -}}
 # see https://secure.php.net/manual/en/opcache.installation.php
 RUN set -eux; \
-	docker-php-ext-enable opcache; \
 	{ \
 		echo 'opcache.memory_consumption=128'; \
 		echo 'opcache.interned_strings_buffer=8'; \