Add a standalone build test pipeline to Yamato to check for player script compilation errors. (#2779)

.yamato/standalone-build-test.yml

+name: Mac Standalone Build Test
+triggers:
+  branches:
+    only:
+      - "/develop-.*/"
+  targets:
+    only:
+      - "develop"
+  pull_requests:
+    - targets:
+        only:
+          - "master"
+          - "/release-.*/"
+          - "/hotfix-.*/"
+
+agent:
+  type: Unity::VM::osx
+  image: ml-agents/ml-agents-bokken-mac:latest
+  flavor: i1.small
+
+variables:
+  LC_ALL: "en_US.UTF-8"
+commands:
+  - ./run-standalone-build-osx.sh

UnitySDK/Assets/ML-Agents/Editor/Tests/StandaloneBuildTest.cs

+using System;
+using UnityEditor;
+using UnityEngine;
+
+namespace MLAgents
+{
+    public class StandaloneBuildTest
+    {
+        static void BuildStandalonePlayerOSX()
+        {
+            string[] scenes = { "Assets/ML-Agents/Examples/3DBall/Scenes/3DBall.unity" };
+            var error = BuildPipeline.BuildPlayer(scenes, "testPlayer", BuildTarget.StandaloneOSX, BuildOptions.None);
+            if (string.IsNullOrEmpty(error))
+            {
+                EditorApplication.Exit(0);
+            }
+            else
+            {
+                Console.Error.WriteLine(error);
+                EditorApplication.Exit(1);
+                
+            }
+            Debug.Log(error);
+        }
+        
+    }
+}

UnitySDK/Assets/ML-Agents/Editor/Tests/StandaloneBuildTest.cs.meta

+fileFormatVersion: 2
+guid: a0c87e095448c49e9812863bb5d1f4e1
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

run-standalone-build-osx.sh

+#!/bin/bash
+
+set -eo pipefail
+
+EDITOR_VERSION="2017.4.33f1"
+BOKKEN_UNITY="/Users/bokken/${EDITOR_VERSION}/Unity.app/Contents/MacOS/Unity"
+HUB_UNITY="/Applications/Unity/Hub/Editor/${EDITOR_VERSION}/Unity.app/Contents/MacOS/Unity"
+
+if [[ -f ${BOKKEN_UNITY} ]]; then 
+    UNITY=${BOKKEN_UNITY}
+else
+    UNITY=${HUB_UNITY}
+fi 
+
+pushd $(dirname "${0}") > /dev/null
+BASETPATH=$(pwd -L)
+popd > /dev/null
+
+echo "Cleaning previous results"
+
+echo "Starting tests via $UNITY"
+
+CMD_LINE="$UNITY -projectPath $BASETPATH/UnitySDK -batchmode -executeMethod MLAgents.StandaloneBuildTest.BuildStandalonePlayerOSX"
+
+echo "$CMD_LINE ..."
+
+${CMD_LINE}
+RES=$?
+
+if [[ "${RES}" -eq "0" ]]; then
+    echo "Standalone build completed successfully.";
+    exit 0;
+else
+    echo "Standalone build failed."
+    exit 1;
+fi
+
+exit ${RES}