Try using ccache on macOS CI too

.azure/ci-macos-job.yml

@@ -15,8 +15,9 @@ jobs:
       Py310:
         python.version: '3.10'
 
-
-  variables: {'PYTHONUNBUFFERED': '1'}
+  variables:
+    PYTHONUNBUFFERED: '1'
+    CCACHE_DIR: $(Pipeline.Workspace)/ccache
 
   steps:
   - checkout: self
@@ -26,6 +27,19 @@ jobs:
     inputs:
       versionSpec: '$(python.version)'
 
+  - script: |
+      brew install ccache
+      echo "##vso[task.prependpath]/usr/local/opt/ccache/libexec"
+    displayName: 'Install brew package requirements & setup ccache'
+
+  - task: Cache@2
+    inputs:
+      key: 'ccache | "$(Agent.OS)" | "$(python.version)" | "$(Build.BuildNumber)"'
+      path: $(CCACHE_DIR)
+      restoreKeys: |
+        ccache | "$(Agent.OS)" | "$(python.version)"
+    displayName: ccache
+
   - script: |
       python -m pip install -U setuptools wheel
       python -m pip install -r requirements.txt