Simplify build workflow by removing macOS steps

Removed macOS build steps and adjusted Docker push command.

Author: astomodynamics

.github/workflows/build.yaml

@@ -27,22 +27,3 @@ jobs:
     - name: Push the Docker image (optional)
       if: runner.os == 'Linux'
       run: docker push astomodynamics/cddp-cpp
-      
-    # For macOS, build directly without Docker
-    - name: Install dependencies on macOS
-      if: runner.os == 'macOS'
-      run: |
-        # Basic dependencies
-        brew install eigen || true
-        brew uninstall --ignore-dependencies cmake || true
-        brew install cmake
-        
-        # Dependencies for matplotplusplus
-        brew install gnuplot
-
-    - name: Build on macOS
-      if: runner.os == 'macOS'
-      run: |
-        mkdir -p build && cd build
-        cmake .. 
-        make -j4