Split test and lint workflows (#1183)

.github/workflows/unit_tests.yml

@@ -0,0 +1,24 @@
+name: Unit tests
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-20.04
+    strategy:
+      matrix:
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install .
+      - name: Run unit tests
+        run: |
+          python -m unittest discover -v tests/unit