add back github workfl

.github/workflows/ci-testing.yml

@@ -0,0 +1,30 @@
+name: CILint
+
+on: [push]
+
+jobs:
+  unit_tests:
+    name: Unit tests for DMS
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        python-version: ["3.11"]
+        os: [ubuntu-latest]
+        include:
+          # Use ubuntu 20.04 for python 3.6 (dropped from later versions)
+          - python-version: 3.6
+            os: ubuntu-20.04
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Python${{ matrix.python-version }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install tox
+      - name: Tox
+        run: |
+          tox