php8: adapt test.sh for upcoming opkg -> apk transition

We used to rely on opkg to install the CLI tool for testing
PHP modules, but when opkg is not available anymore, we have to
use apk. The (simple) switch logic assumes, that only one
of both package manager tools is installed.

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

lang/php8/test.sh

@@ -14,7 +14,11 @@ case "$1" in
 		PHP_MOD="${1#php8-mod-}"
 		PHP_MOD="${PHP_MOD//-/_}"
 
-		opkg install php8-cli
+		if command -v opkg >/dev/null 2>&1; then
+			opkg install php8-cli
+		else
+			apk add php8-cli
+		fi
 
 		php8-cli -m | grep -i "$PHP_MOD"
 		;;