Added jenkins pipeline (#7)

Run tests with pytest

.jenkins/python3/Dockerfile

@@ -0,0 +1,10 @@
+FROM docker.openmodelica.org/build-deps:v1.16.2
+
+RUN apt-get update \
+  && apt-get install -qy gnupg wget ca-certificates apt-transport-https sudo \
+  && echo "deb https://build.openmodelica.org/omc/builds/linux/releases/1.14.2/ `lsb_release -sc`  release" > /etc/apt/sources.list.d/openmodelica.list \
+  && wget https://build.openmodelica.org/apt/openmodelica.asc -O- | apt-key add - \
+  && apt-get update \
+  && apt-get install -qy --no-install-recommends omc omlib-modelica-3.2.2 \
+  && rm -rf /var/lib/apt/lists/*
+RUN pip3 install --no-cache pytest

Jenkinsfile

@@ -1,17 +1,28 @@
 pipeline {
-  agent any
+  agent none
   stages {
-    stage('') {
-      agent {
-        node {
-          label 'linux'
+    stage('test') {
+      parallel {
+        stage('python3') {
+          agent {
+            dockerfile {
+              // Large image with full OpenModelica build dependencies; lacks omc and OMPython
+              label 'linux'
+              dir '.jenkins/python3'
+              additionalBuildArgs '--pull'
+            }
+          }
+          steps {
+            sh 'hostname'
+            sh 'HOME="$PWD" python3 setup.py install --user'
+            sh '''
+            export HOME="$PWD"
+            pytest -v --junit-xml=py3.xml testing
+            '''
+            junit 'py3.xml'
+          }
         }
-
-      }
-      steps {
-        sh 'hostname'
       }
     }
-
   }
-}
+}