Reorder GitHub Actions checkout step.

.github/workflows/main.yml

@@ -6,16 +6,16 @@ jobs:
   build-android:
     runs-on: ubuntu-latest
     steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+      with:
+        submodules: true
     - name: Setup Java 11
       uses: actions/setup-java@v2
       with:
         distribution: adopt-hotspot
         java-version: 11
         cache: gradle
-    - name: Checkout
-      uses: actions/checkout@v2
-      with:
-        submodules: true
     - name: Build
       run: bash ./gradlew assembleNormalDebug assembleNormalRelease assembleEmbedRelease bundleNormalRelease bundleEmbedRelease
     - name: Artifact (normal debug APK)