fix github workflow for mongomock testing

.github/workflows/test.yml

@@ -32,3 +32,31 @@ jobs:
 
       - name: Run fireworks tests
         run: pytest fireworks
+
+  pytest_mongomock:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: 3.8
+
+      - name: Install dependencies
+        run: |
+          pip install -r requirements.txt -r requirements-ci.txt
+          pip install '.[workflow-checks,graph-plotting,flask-plotting,mongomock]'
+
+      - name: Setup mongomock server store
+        run: |
+          server_store_file=$PWD/server_store_${RANDOM}-${RANDOM}-${RANDOM}.json
+          echo "{}" > $server_store_file
+          export MONGOMOCK_SERVERSTORE_FILE=$server_store_file
+
+      - name: Run fireworks tests with mongomock
+        run: |
+          pytest -m "not mongodb" fireworks
+          rm -f $server_store_file