[android] Add GH action to publish snapshots.

.github/workflows/spine-android.yml

@@ -17,6 +17,12 @@ jobs:
         distribution: 'zulu'
         java-version: "8"
 
+    - name: Setup Android SDK
+      uses: android-actions/setup-android@v3
+      with:
+        api-level: 34
+        build-tools: 35.0.0
+
     - name: Cache Gradle packages
       uses: actions/cache@v3
       with: