Added cleanup to generated service account file (#116)

Co-authored-by: Drew Heavner <veedubusc@gmail.com>

src/main.ts

@@ -121,7 +121,13 @@ async function run() {
 
         console.log(`Finished uploading to the Play Store: ${result}`)
     } catch (error: any) {
-        core.setFailed(error.toString())
+        core.setFailed(error.message)
+    } finally {
+        if (core.getInput('serviceAccountJsonPlainText', { required: false})) {
+            // Cleanup our auth file that we created.
+            core.debug('Cleaning up service account json file');
+            fs.unlinkSync('./serviceAccountJson.json');
+        }
     }
 }