fix(build-system-tests): pin ANDROID_AVD_HOME so emulator finds the created AVD (#7043)

Author: pranavosu

.github/workflows/reusable-build-system-test-react-native.yml

@@ -88,6 +88,13 @@ jobs:
         if: ${{ matrix.platform == 'android' }}
         run: |
           echo "ANDROID_HOME=$ANDROID_HOME"
+          # The new avdmanager writes AVDs to $HOME/.config/.android/avd, but the
+          # emulator looks in $ANDROID_AVD_HOME (default $HOME/.android/avd). Pin both
+          # tools to the same directory so the created AVD is actually found, and
+          # persist it via $GITHUB_ENV so the "Start Android emulator" step agrees.
+          export ANDROID_AVD_HOME="$HOME/.android/avd"
+          echo "ANDROID_AVD_HOME=$ANDROID_AVD_HOME" >> "$GITHUB_ENV"
+          mkdir -p "$ANDROID_AVD_HOME"
           yes | $ANDROID_HOME/cmdline-tools/latest/bin/sdkmanager --licenses > /dev/null || true
           $ANDROID_HOME/cmdline-tools/latest/bin/sdkmanager --install "platform-tools" "emulator" "build-tools;33.0.2" "platforms;android-27" "system-images;android-27;default;x86_64"
           # `--tag` and `--abi` must be passed explicitly: without them avdmanager