Adds separate test for wheels building

.github/workflows/wheeltest.yml

@@ -0,0 +1,59 @@
+name: Test wheel file build
+
+on: [push, pull_request]
+
+jobs:
+  build_wheels:
+    name: Build wheels on ${{ matrix.os }} for Python ${{ matrix.pyver }}
+ #   if: github.event_name == 'pull_request'
+    runs-on: ${{ matrix.os }}
+    continue-on-error: true
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-13, macos-14] 
+        pyver: [cp311]
+
+    steps:
+      - name: Checks out repo
+        uses: actions/checkout@v4
+
+      - name: Symlink gfortran for x86 macOS
+        if: matrix.os == 'macos-13'
+        run: |
+          # make sure gfortran is available
+          ln -s /usr/local/bin/gfortran-13 /usr/local/bin/gfortran
+          gfortran --version
+
+
+      - name: Symlink gfortran for ARM macOS
+        if: matrix.os == 'macos-14'
+        run: |
+          # make sure gfortran is available
+          ln -s /opt/homebrew/bin/gfortran-13 /opt/homebrew/bin/gfortran
+          gfortran --version
+
+      - name: Link to LLVM compiler for macOS
+        if: (matrix.os == 'macos-13') || (matrix.os == 'macos-14')
+        run: |
+          export CC=$(brew --prefix llvm@15)/bin/clang
+          export CFLAGS=-I/$(brew --prefix llvm@15)/include
+          export LDFLAGS=-L/$(brew --prefix llvm@15)/lib
+          echo $CC
+          echo $CFLAGS
+          echo $LDFLAGS 
+
+      - name: Build wheels
+        if: ${{ !(matrix.os == 'macos-14' && matrix.pyver == 'cp37') }}
+        uses: pypa/[email protected]
+        env:
+            CIBW_BUILD: ${{matrix.pyver}}-*
+            CIBW_SKIP: "pp37-* cp37-* *-win32 *-manylinux_i686"
+            CIBW_ARCHS_LINUX: auto
+            CIBW_BEFORE_BUILD: pip install numpy 'forthon>=0.10.7' 'build<0.10.0'
+
+      - name: Upload Artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: cibw-wheels-${{ matrix.os }}-${{ matrix.pyver }}-${{ strategy.job-index }}
+          path: ./wheelhouse/*.whl