fixup! Integrate tests into CI

Author: RainerKuemmerle

.github/workflows/ci.yml

@@ -26,7 +26,7 @@ jobs:
     - name: Install dependencies on Ubuntu
       run: |
           sudo apt update
-          sudo apt install libeigen3-dev libspdlog-dev nlohmann-json3-dev
+          sudo apt install libeigen3-dev libspdlog-dev nlohmann-json3-dev python3-pytest
     - name: Build
       run: pipx run build
     - name: Run tests