fixing python ci isssues

.github/workflows/cmake-linux.yml

@@ -88,6 +88,13 @@ jobs:
 
     - name: Test
       working-directory: ${{github.workspace}}/build
+      # PYTHONNOUSERSITE=1: prevent the embedded Python interpreter from
+      # loading numpy / other site-packages from ~/.local that were compiled
+      # against a different ABI than the build-time Python (causes numpy
+      # 1.x/2.x mismatch crashes in test_pydetector / test_pydescriptor /
+      # test_pymatcher).
+      env:
+        PYTHONNOUSERSITE: 1
       run: |
         ctest -C ${{env.BUILD_TYPE}} --output-on-failure
         ctest -C ${{env.BUILD_TYPE}} --output-on-failure --rerun-failed

.github/workflows/cmake-macos.yml

@@ -92,6 +92,11 @@ jobs:
 
     - name: Test
       working-directory: ${{github.workspace}}/build
+      # PYTHONNOUSERSITE=1: prevent the embedded Python interpreter from
+      # loading numpy / other site-packages from the user's site that were
+      # compiled against a different ABI than the build-time Python.
+      env:
+        PYTHONNOUSERSITE: 1
       run: |
         ctest -C ${{env.BUILD_TYPE}} --output-on-failure
         ctest -C ${{env.BUILD_TYPE}} --output-on-failure --rerun-failed

.github/workflows/cmake-windows.yml

@@ -77,6 +77,14 @@ jobs:
 
     - name: Test
       working-directory: ${{github.workspace}}/build
+      # PYTHONNOUSERSITE=1: prevent the embedded Python interpreter from
+      # loading numpy / other site-packages from %APPDATA%\Python that
+      # were compiled against a different ABI than the build-time Python
+      # (causes "Could not find platform independent libraries <prefix>"
+      # + numpy 1.x/2.x mismatch crashes in test_pydetector / test_pydescriptor
+      # / test_pymatcher).
+      env:
+        PYTHONNOUSERSITE: 1
       run: |
         ctest -C ${{env.BUILD_TYPE}} --output-on-failure --timeout 300
         ctest -C ${{env.BUILD_TYPE}} --output-on-failure --timeout 300 --rerun-failed