修复CI报错，explorer和hub的demo同时编译

Change-Id: Ia24e6a1feb3c27d824c1937c05757d2cf54cb04c

Author: SundoggyNew

.github/workflows/debug.yml

@@ -93,7 +93,7 @@ jobs:
           sed -i 's#//xxx##g' explorer/explorer-device-rtc/build.gradle
           sed -i 's#//xxx##g' explorer/explorer-device-video/build.gradle
           ./gradlew clean
-          ./gradlew :explorer:device-android-demo:build
+          ./gradlew :explorer:device-android-demo:build :hub:hub-android-demo:build
       - name: Archive the apks
         uses: actions/upload-artifact@v2
         with:

.github/workflows/release.yml

@@ -96,7 +96,7 @@ jobs:
           sed -i 's#//xxx##g' explorer/explorer-device-rtc/build.gradle
           sed -i 's#//xxx##g' explorer/explorer-device-video/build.gradle
           ./gradlew clean
-          ./gradlew :explorer:device-android-demo:build
+          ./gradlew :explorer:device-android-demo:build :hub:hub-android-demo:build
 #      - name: Archive the apks
 #        uses: actions/upload-artifact@v2
 #        with: