using homebrew to install clang tools on mac runner (#244)

- manually symlink llvm binaries
- continue despite homebrew error

Author: 2bndy5

action.yml

@@ -234,6 +234,15 @@ runs:
           fi
         fi
 
+    - name: Install MacOS clang dependencies
+      if: runner.os == 'macOS'
+      shell: bash
+      continue-on-error: true
+      run: |
+        brew install llvm@${{ inputs.version }}
+        ln -s "$(brew --prefix llvm@${{ inputs.version }})/bin/clang-format" "/usr/local/bin/clang-format-${{ inputs.version }}"
+        ln -s "$(brew --prefix llvm@${{ inputs.version }})/bin/clang-tidy" "/usr/local/bin/clang-tidy-${{ inputs.version }}"
+
     - name: Setup python venv (Unix)
       if: runner.os == 'Linux' || runner.os == 'macOS'
       shell: bash