snuffleupagus: enable .rules

This module uses very strict defaults which block almost everything.

install-php-extensions

@@ -1012,6 +1012,13 @@ installModuleFromSource() {
 	make -j$(nproc) install
 	cd - >/dev/null
 	docker-php-ext-enable "$1"
+	case "$1" in
+		snuffleupagus) # otherwise php -m will be empty
+			printf '%s\n%s\n' 'extension=snuffleupagus.so' \
+				'sp.configuration_file=/usr/local/etc/php/conf.d/snuffleupagus.rules' \
+					> /usr/local/etc/php/conf.d/docker-php-ext-snuffleupagus.ini
+		;;
+	esac
 }
 
 # Install a PECL PHP module given its handle