Add new option to specify behavior if no files found (#104)

* Add new option to specify behavior if no files found

src/upload-inputs.ts

@@ -0,0 +1,18 @@
+import {NoFileOptions} from './constants'
+
+export interface UploadInputs {
+  /**
+   * The name of the artifact that will be uploaded
+   */
+  artifactName: string
+
+  /**
+   * The search path used to describe what to upload as part of the artifact
+   */
+  searchPath: string
+
+  /**
+   * The desired behavior if no files are found with the provided search path
+   */
+  ifNoFilesFound: NoFileOptions
+}