CI: Add macOS.

.github/workflows/actions/macos/generateCacheKey/action.yml

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+# SPDX-License-Identifier: LGPL-2.1-or-later
+# ***************************************************************************
+# *                                                                         *
+# *   Copyright (c) 2023 0penBrain.                                         *
+# *                                                                         *
+# *   This file is part of FreeCAD.                                         *
+# *                                                                         *
+# *   FreeCAD is free software: you can redistribute it and/or modify it    *
+# *   under the terms of the GNU Lesser General Public License as           *
+# *   published by the Free Software Foundation, either version 2.1 of the  *
+# *   License, or (at your option) any later version.                       *
+# *                                                                         *
+# *   FreeCAD is distributed in the hope that it will be useful, but        *
+# *   WITHOUT ANY WARRANTY; without even the implied warranty of            *
+# *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      *
+# *   Lesser General Public License for more details.                       *
+# *                                                                         *
+# *   You should have received a copy of the GNU Lesser General Public      *
+# *   License along with FreeCAD. If not, see                               *
+# *   <https://www.gnu.org/licenses/>.                                      *
+# *                                                                         *
+# ***************************************************************************
+
+name: generateCacheKey
+description: "macOS: generates a cache key taking into account distro and compiler"
+
+inputs:
+  compiler:
+    description: "Binary name/path of compiler to be used"
+    required: true
+outputs:
+  cacheKey:
+    description: "Cache key with distro and compiler version"
+    value: ${{ steps.generateCacheKey.outputs.cacheKey }}
+
+runs:
+  using: "composite"
+  steps:
+    - id: generateCacheKey
+      shell: bash -l {0}
+      run: |
+        cacheKey=$(sw_vers --productName)-$(sw_vers --productVersion)-$(basename ${{ inputs.compiler }})$(${{ inputs.compiler }} -dumpfullversion -dumpversion)
+        echo "Generated cache key : $cacheKey"
+        echo "cacheKey=$cacheKey" >> $GITHUB_OUTPUT