Add brew to preinstall test matrix (open-quantum-safe#205)

* standalone cmake-only parallelized brew test

Signed-off-by: Felipe Ventura <felipe.ventura@entrust.com>

.github/workflows/standalone.yml

@@ -8,6 +8,20 @@ on:
 
 jobs:
 
+  macos_intel:
+    runs-on: macos-13
+    strategy:
+      fail-fast: false
+    steps:
+      - name: Install prerequisites
+        run: brew install liboqs
+      - name: Checkout oqsprovider code
+        uses: actions/checkout@v2
+      - name: Build oqsprovider
+        run: cmake -DOPENSSL_ROOT_DIR=/usr/local/opt/openssl@3 -S . -B _build && cmake --build _build
+      - name: Test oqsprovider
+        run: ctest --parallel 5 --test-dir _build
+
   linux_intel:
     runs-on: ubuntu-latest
     strategy:
@@ -29,3 +43,4 @@ jobs:
         run: ./scripts/fullbuild.sh
       - name: Test
         run: ./scripts/runtests.sh -V
+