Update and rename blank.yml to workflow.yml

Author: Econa77

.github/workflows/workflow.yml

@@ -0,0 +1,18 @@
+name: CI
+on: [push, pull_request]
+jobs:
+  test:
+    runs-on: macOS-10.14
+    steps:
+    - uses: actions/checkout@v1
+
+    - name: Submodule init
+      run: git submodule update --init --recursive
+
+    - name: Xcode select
+      run: sudo xcode-select -s /Applications/Xcode_10.3.app
+
+    - name: Run tests
+      run: |
+        bundle install
+        bundle exec fastlane scan