fix: debug pixi environment in CI

.tangled/workflows/build.yml

···
 
 steps:
   - name: "Install dependencies"
-    command: "pixi install"
+    command: |
+      echo "=== Installing pixi dependencies ==="
+      pixi install
+      echo "=== Checking pixi env ==="
+      ls -la .pixi/envs/default/bin/ | head -20
+      echo "=== PATH ==="
+      echo $PATH
 
   - name: "Run tests"
-    command: "pixi run test"
+    command: |
+      echo "=== Running tests ==="
+      .pixi/envs/default/bin/pytest -v
 
   - name: "Run linters"
     command: "pixi run pre-commit-run"