Add Buildkite Test Analytics environment variables to test plan

Author: mokagio

Example/Tests/UnitTests.xctestplan

@@ -9,6 +9,45 @@
     }
   ],
   "defaultOptions" : {
+    "environmentVariableEntries" : [
+      {
+        "key" : "BUILDKITE_ANALYTICS_TOKEN",
+        "value" : "$(BUILDKITE_ANALYTICS_TOKEN)"
+      },
+      {
+        "key" : "BUILDKITE_BRANCH",
+        "value" : "$(BUILDKITE_BRANCH)"
+      },
+      {
+        "key" : "BUILDKITE_BUILD_ID",
+        "value" : "$(BUILDKITE_BUILD_ID)"
+      },
+      {
+        "key" : "BUILDKITE_BUILD_NUMBER",
+        "value" : "$(BUILDKITE_BUILD_NUMBER)"
+      },
+      {
+        "key" : "BUILDKITE_BUILD_URL",
+        "value" : "$(BUILDKITE_BUILD_URL)"
+      },
+      {
+        "key" : "BUILDKITE_COMMIT",
+        "value" : "$(BUILDKITE_COMMIT)"
+      },
+      {
+        "key" : "BUILDKITE_JOB_ID",
+        "value" : "$(BUILDKITE_JOB_ID)"
+      },
+      {
+        "key" : "BUILDKITE_MESSAGE",
+        "value" : "$(BUILDKITE_MESSAGE)"
+      }
+    ],
+    "targetForVariableExpansion" : {
+      "containerPath" : "container:WPMediaPicker.xcodeproj",
+      "identifier" : "6003F589195388D20070C39A",
+      "name" : "WPMediaPicker"
+    },
     "testTimeoutsEnabled" : true
   },
   "testTargets" : [