Merge pull request #8253 from infosiftr/php-opcache

Stop building "opcache" in "php-ext-install" test

test/tests/php-ext-install/container.sh

@@ -5,6 +5,7 @@ docker-php-ext-install pdo_mysql 2>&1
 php -r 'exit(extension_loaded("pdo_mysql") ? 0 : 1);'
 grep -q '^extension=' /usr/local/etc/php/conf.d/*pdo_mysql*.ini
 
-docker-php-ext-install opcache 2>&1
+# opcache is pre-built by default at least as far back as PHP 5.5
+docker-php-ext-enable opcache 2>&1
 php -r 'exit(extension_loaded("Zend OPcache") ? 0 : 1);'
 grep -q '^zend_extension=' /usr/local/etc/php/conf.d/*opcache*.ini