Only upload OpenAPI artifacts for ubuntu-latest tests

.github/workflows/ci-tests.yml

@@ -16,6 +16,9 @@ jobs:
     strategy:
       matrix:
         os: ["ubuntu-latest", "macos-latest", "windows-latest"]
+        include:
+          - os: ubuntu-latest
+            openapi: true
 
     runs-on: "${{ matrix.os }}"
     steps:
@@ -44,6 +47,7 @@ jobs:
       # - name: Publish code coverage results
 
       - name: Publish OpenAPI Artifact
+        if: ${{ matrix.openapi }}
         uses: actions/upload-artifact@c7d193f32edcb7bfad88892161225aeda64e9392 # v4
         with:
           name: "OpenAPI Spec"