Try setting all NDK env vars

Author: anonymous-akorn

.github/workflows/cpp-packaging.yml

@@ -551,10 +551,13 @@ jobs:
         python scripts/gha/restore_secrets.py --passphrase "${{ secrets.TEST_SECRET }}"
     - name: Build integration tests (and run Desktop tests)
       # The set up script for Android will download the NDK here.
-        # Need to export from bash, so that /tmp gets converted on Windows.
+      # Need to export from bash, so that /tmp gets converted on Windows.
+      env:
+          NDK_ROOT: /tmp/android-ndk-r16b
+          ANDROID_NDK_HOME: /tmp/android-ndk-r16b
+          ANDROID_NDK_PATH: /tmp/android-ndk-r16b
       shell: bash
       run: |
-        export NDK_ROOT=/tmp/android-ndk-r16b
         python scripts/gha/build_testapps.py --t ${{ env.apis }} --p ${{ matrix.target_platform }} --sdk_dir firebase_cpp_sdk --output_directory ${{ github.workspace }} --execute_desktop_testapp --noadd_timestamp
 
     # Workaround for https://github.com/GoogleCloudPlatform/github-actions/issues/100

.github/workflows/integration_tests.yml

@@ -116,7 +116,11 @@ jobs:
 
       - name: Build integration tests (and run Desktop tests)
         # The set up script for Android will download the NDK here.
-        # Need to export from bash, so that /tmp gets converted on Windows.
+        # Need to use bash, so that /tmp gets converted on Windows.
+        env:
+          NDK_ROOT: /tmp/android-ndk-r16b
+          ANDROID_NDK_HOME: /tmp/android-ndk-r16b
+          ANDROID_NDK_PATH: /tmp/android-ndk-r16b
         shell: bash
         run: |
           export NDK_ROOT=/tmp/android-ndk-r16b