Test with multiple PHP versions

run-docker-testsuite.sh

@@ -1,5 +1,9 @@
-docker run -d -v .:/root --name cloudobjects-sdk-test cloudobjects/php-build-base:8.4
+#!/bin/bash
+
+for version in 8.3 8.4; do
+    docker run -d -v .:/root --name cloudobjects-sdk-test cloudobjects/php-build-base:$version
     docker exec -t cloudobjects-sdk-test bash -c "cd /root && composer install"
     docker exec -t cloudobjects-sdk-test bash -c "cd /root && vendor/bin/phpunit"
     docker stop cloudobjects-sdk-test
     docker rm cloudobjects-sdk-test
+done