Improve CI robustness for macOS builds

- Use brew install ffmpeg for macOS instead of setup-ffmpeg action
- Install core dependencies (numpy, scipy, matplotlib, opencv-python) first
- Add basic import test to verify installation
- Separate FFmpeg installation by OS for better reliability
- Should resolve Python 3.10 macOS build failures

Author: Alexander Refsum Jensenius

.github/workflows/ci.yml

@@ -22,16 +22,30 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
-    - name: Install FFmpeg and FFprobe
-      uses: FedericoCarboni/setup-ffmpeg@v3
-      id: setup-ffmpeg
-
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
 
-    - name: Install dependencies
+    - name: Install system dependencies on macOS
+      if: runner.os == 'macOS'
+      run: |
+        brew install ffmpeg
+
+    - name: Install FFmpeg on Ubuntu/Windows
+      if: runner.os != 'macOS'
+      uses: FedericoCarboni/setup-ffmpeg@v3
+      id: setup-ffmpeg
+
+    - name: Install Python dependencies
       run: |
         python -m pip install --upgrade pip
-        python -m pip install musicalgestures
+        python -m pip install numpy scipy matplotlib opencv-python
+        
+    - name: Install musicalgestures
+      run: |
+        python -m pip install musicalgestures
+      
+    - name: Test basic import
+      run: |
+        python -c "import musicalgestures; print('MGT-python import successful')"