Merge remote-tracking branch 'local-skel/add-code-style-checks' into new-skeleton-ruff2

Author: pombredanne

etc/ci/azure-posix.yml

@@ -5,6 +5,9 @@ parameters:
     test_suites: {}
     python_architecture: x64
 
+variables:
+    PIP_CACHE_DIR: $(Pipeline.Workspace)/.pip
+
 jobs:
     - job: ${{ parameters.job_name }}
 
@@ -29,6 +32,14 @@ jobs:
                     architecture: '${{ parameters.python_architecture }}'
                 displayName: '${{ pyver }} - Install Python'
 
+              - task: Cache@2
+                inputs:
+                    key: 'pip | "$(Agent.OS)" | requirements.txt'
+                    restoreKeys: |
+                        'pip | "$(Agent.OS)"'
+                    path: $(PIP_CACHE_DIR)
+                    displayName: Cache pip downloaded packages
+
               - script: |
                     python${{ pyver }} --version
                     echo "python${{ pyver }}" > PYTHON_EXECUTABLE