[Test] (CMake, CI): enable top-level testing and label tests (unit/benchmark/integration) so ctest runs from the build root

.github/workflows/test.yml

@@ -107,6 +107,7 @@ jobs:
             --exclude='build.ninja' \
             --exclude='cmake_install.cmake' \
             -czf ci-artifacts/mobilegl-linux-runtime.tgz \
+            "${BUILD_DIR}/CTestTestfile.cmake" \
             "${BUILD_DIR}/MobileGL/MG_Test" \
             "${BUILD_DIR}/MobileGL/MG_Benchmark" \
             "${SHARED_LIBS[@]}"
@@ -156,12 +157,12 @@ jobs:
           PY
 
       - name: Test
-        working-directory: build-linux/MobileGL/MG_Test
+        working-directory: build-linux
         run: |
           if [ "${{ secrets.ACTIONS_STEP_DEBUG }}" = "true" ]; then
-            ctest -V
+            ctest -V -L unit --no-tests=error
           else
-            ctest --output-on-failure
+            ctest --output-on-failure -L unit --no-tests=error
           fi
 
   benchmark:
@@ -202,8 +203,8 @@ jobs:
           PY
 
       - name: Benchmark
-        working-directory: build-linux/MobileGL/MG_Benchmark
-        run: ctest -V -C Release
+        working-directory: build-linux
+        run: ctest -V -C Release -L benchmark --no-tests=error
 
   build-retrace:
     runs-on: ubuntu-latest