[TESTS] Add test container with Xdebug and allow for generation of coverage reports with 'make test'

docker/php/entrypoint.sh

@@ -6,6 +6,12 @@ echo "Got response from DB"
 
 for script in /var/entrypoint.d/*.sh; do
     $script
+    ret=$?
+    if [ $ret -eq 64 ]; then
+        exit 0
+    elif [ $ret -eq 65 ]; then
+        exit 1
+    fi
 done
 
 exec php-fpm