Support passing runInstrumentation flag as gradle argument (#237)

* Support passing `runInstrumentation` flag as gradle argument

Will allow overriding the configuration set in the gradle file with the commandline argument. 

e.g ./gradlew executeScreenshotTests -PrunInstrumentation=false

* Run formatting command

Co-authored-by: Sam <samdc@apadmi.com>

shot/src/main/scala/com/karumi/shot/ShotPlugin.scala

@@ -25,6 +25,7 @@ import org.gradle.api.artifacts.DependencySet
 import org.gradle.api.tasks.TaskProvider
 import org.gradle.api.{Plugin, Project}
 
+import scala.util.Try
 class ShotPlugin extends Plugin[Project] {
 
   private val console = new Console
@@ -182,7 +183,7 @@ class ShotPlugin extends Plugin[Project] {
       task.appId = appId
     }
 
-    if (extension.runInstrumentation) {
+    if (runInstrumentation(project, extension)) {
       executeScreenshot.configure { task =>
         task.dependsOn(instrumentationTaskName)
         task.dependsOn(downloadScreenshots)
@@ -219,6 +220,20 @@ class ShotPlugin extends Plugin[Project] {
       }
   }
 
+  private def runInstrumentation(project: Project, extension: ShotExtension): Boolean = {
+    val property = project.findProperty("runInstrumentation").asInstanceOf[String]
+
+    if (property != null) {
+      if (Try(property.toBoolean).getOrElse(null) == null) {
+        throw ShotException("runInstrumentation value must be true|false")
+      }
+
+      return property.toBoolean
+    }
+
+    extension.runInstrumentation
+  }
+
   private def isAnAndroidLibrary(project: Project): Boolean =
     try {
       getAndroidLibraryExtension(project)