Remove matrix

.github/workflows/main.yml

@@ -121,12 +121,6 @@ jobs:
     # https://github.com/ReactiveCircus/android-emulator-runner#usage
     runs-on: macos-latest
     timeout-minutes: 30
-    strategy:
-      fail-fast: false
-      matrix:
-        api-level: [30]
-        # The package requires the PlayStore on the device.
-        target: [google_atd]
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-java@v3
@@ -148,8 +142,17 @@ jobs:
           USER_1_EMAIL: ${{ secrets.INTEGRATION_TEST_USER_1_EMAIL }}
           USER_1_PASSWORD: ${{ secrets.INTEGRATION_TEST_USER_1_PASSWORD }}
         with:
-          api-level: ${{ matrix.api-level }}
-          target: ${{ matrix.target }}
+          # We use the "google_atd" target because it's designed for automated
+          # testing.
+          #
+          # See
+          # https://android-developers.googleblog.com/2021/10/whats-new-in-scalable-automated-testing.html.
+          #
+          # Because of the use of "google_atd" we are bit limited in the choice
+          # of API level, arch and channel. See here all requirements:
+          # https://github.com/ReactiveCircus/android-emulator-runner#configurations 
+          api-level: 30
+          target: google_atd
           arch: x86
           profile: pixel_3a
           channel: canary