Fix ci build bug (#891)

Author: seungsoo47

.github/workflows/build.yml

@@ -65,6 +65,7 @@ jobs:
         if: ${{ env.HAS_CHANGED_PACKAGES == 'true' }}
         run: |
           export PATH=`pwd`/flutter-tizen/bin:$PATH
+          export FLUTTER_ROOT=`pwd`/flutter-tizen/flutter
           dbus-run-session -- bash -c "
           echo tizen | gnome-keyring-daemon --unlock &&
           ./tools/tools_runner.sh build-examples \

.github/workflows/integration_test.yml

@@ -30,6 +30,7 @@ jobs:
         if: ${{ github.event_name == 'pull_request' }}
         run: |
           export PATH=`pwd`/flutter-tizen/bin:$PATH
+          export FLUTTER_ROOT=`pwd`/flutter-tizen/flutter
           ./tools/tools_runner.sh integration-test \
             --recipe ./.github/recipe.yaml \
             --generate-emulators \
@@ -39,6 +40,7 @@ jobs:
         if: ${{ github.event_name == 'push' }}
         run: |
           export PATH=`pwd`/flutter-tizen/bin:$PATH
+          export FLUTTER_ROOT=`pwd`/flutter-tizen/flutter
           ./tools/tools_runner.sh integration-test \
             --recipe ./.github/recipe.yaml \
             --generate-emulators