Add test file for ert with flow without flowrun

.github/workflows/test_ert_with_flow.yml

@@ -0,0 +1,44 @@
+on:
+  workflow_call:
+    inputs:
+      os:
+        type: string
+      python-version:
+        type: string
+
+env:
+  UV_SYSTEM_PYTHON: 1
+
+jobs:
+  test-ert-with-flow:
+    name: Run ert tests
+    timeout-minutes: 20
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - uses: actions/setup-python@v5
+      id: setup_python
+      with:
+        python-version: ${{ inputs.python-version }}
+
+    - name: Install uv
+      uses: astral-sh/setup-uv@v4
+
+    - name: Install ert
+      run: |
+        uv pip install ".[dev]"
+
+    - name: Install flow
+      run: |
+        sudo apt install software-properties-common
+        sudo apt-add-repository ppa:opm/ppa
+        sudo apt update
+        sudo apt install mpi-default-bin
+        sudo apt install libopm-simulators-bin python3-opm-common
+
+    - name: Run integration tests towards OPM flow without flowrun
+      run: |
+        set -e
+        pytest tests/ert/unit_tests/resources/test_run_flow_simulator.py