initial Jenkinsfile OSX build configuration

Jenkinsfile

@@ -2,9 +2,30 @@ pipeline {
   agent any
   stages {
     stage('build') {
-      steps {
-        sh 'git status'
+      parallel {
+        stage('OSX Release') {
+          agent {
+            node {
+              label 'mac'
+            }
+          }
+          environment {
+            QT_FATAL_WARNINGS = '1'
+            QMAKESPEC = 'macx-clang'
+          }
+          steps {
+            sh 'git submodule deinit -f .'
+            sh 'git clean -ff -x -d .'
+            sh 'git submodule update --init --recursive --force'
+            sh 'rm -rf ${SHADOW_BUILD_DIR}; mkdir -p ${SHADOW_BUILD_DIR}'
+            sh 'cd ${SHADOW_BUILD_DIR}; ~/Qt/5.9.3/clang_64/bin/qmake -r ${WORKSPACE}/qgroundcontrol.pro CONFIG+=release CONFIG+=WarningsAsErrorsOn'
+            sh 'cd ${SHADOW_BUILD_DIR}; make -j24'
+          }
+        }
       }
     }
   }
+  environment {
+    SHADOW_BUILD_DIR = '/tmp/jenkins/shadow_build_dir'
+  }
 }
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