fix(.github): pass matrix.target to rust-android script

When extracting the emulator script into a separate file, the `matrix.target`
substitution wasn't replaced with an environment variable.

Follow-up to #1950.

.github/workflows/rust-android-run-tests-on-emulator.sh

@@ -5,7 +5,7 @@ adb wait-for-device
 while [[ -z "$(adb shell getprop sys.boot_completed | tr -d '\r')" ]]; do sleep 1; done
 
 any_failures=0
-for test in $(find target/${{ matrix.target }}/debug/deps/ -type f -executable ! -name "*.so" -name "*-*"); do
+for test in $(find target/$TARGET/debug/deps/ -type f -executable ! -name "*.so" -name "*-*"); do
     adb push "$test" /data/local/tmp/
     adb shell chmod +x /data/local/tmp/$(basename "$test")
     adb shell /data/local/tmp/$(basename "$test") || any_failures=1

.github/workflows/rust.yml

@@ -144,6 +144,8 @@ jobs:
         sudo udevadm trigger --name-match=kvm
 
     - name: Set up Android Emulator and run tests
+      env:
+        TARGET: ${{ matrix.target }}
       uses: reactivecircus/android-emulator-runner@v2
       with:
         api-level: ${{ matrix.api-level }}