add Jenkinsfile and Dockerfile-test

docker/Dockerfile-test

@@ -0,0 +1,4 @@
+FROM php:7.4.7-cli-buster
+
+RUN apt-get update && apt-get install -y unzip
+RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer