Actually disable building in build workflow

Author: dwai-wai

.github/workflows/build.yml

@@ -22,7 +22,7 @@ jobs:
       - run: |
           mkdir -p build
           cd build
-          cmake -DBUILD_TESTING=OFF  ..
+          cmake -BUILD_TESTS=OFF  ..
           make
         env:
           CC:   gcc-11