add test-minimum to ci unit tests

Author: andrew-s28

.github/workflows/ci.yml

@@ -33,6 +33,8 @@ jobs:
         include:
           - os: ubuntu
             pixi-environment: "test-py311"
+          - os: ubuntu
+            pixi-environment: "test-minimum"
     steps:
       - uses: actions/checkout@v4
       - name: Restore cached pixi lockfile