add Jenkinsfile and Dockerfile-test

Jenkinsfile

@@ -0,0 +1,41 @@
+pipeline {
+    agent any
+
+    stages {
+        stage('Unit Testing') {
+            agent {
+                dockerfile {
+                    filename 'docker/Dockerfile-test'
+                    dir '.'
+                    reuseNode true
+                }
+            }
+            steps {
+                sh 'vendor/bin/phpunit --log-junit unit_test_results.xml --testdox tests'
+            }
+            post {
+                success {
+                    archiveArtifacts 'unit_test_results.xml'
+                }
+            }
+        }
+
+        stage('Static Code Analysis') {
+            agent {
+                dockerfile {
+                    filename 'docker/Dockerfile-test'
+                    dir '.'
+                    reuseNode true
+                }
+            }
+            steps {
+                sh 'php -d memory_limit=1G vendor/bin/phpstan analyse -c phpstan.neon --error-format=prettyJson > static_code_analysis_results.json'
+            }
+            post {
+                success {
+                    archiveArtifacts 'static_code_analysis_results.json'
+                }
+            }
+        }
+    }
+}

docker/Dockerfile-test

@@ -0,0 +1,7 @@
+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
+
+COPY composer.* workspace/
+RUN cd workspace/ && composer install