Add github actions job to run unit tests for 3.8, 3.9

.github/workflows/unittest.yml

@@ -0,0 +1,34 @@
+name: Unit Test
+
+run-name: Run unit tests
+on: [push]
+
+jobs:
+  run-unit-tests:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.8", "3.9"]
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: |
+          python -m venv venv
+          . venv/bin/activate
+          pip install --upgrade pip
+          pip install -e '.[unittest,typecheck]'
+          pip install --progress-bar=off -r requirements.txt
+          pip install --upgrade --progress-bar=off 'pandas==1.1.5'
+      - name: Typecheck
+        run: |
+          . venv/bin/activate
+          make typecheck
+      - name: Run nosetests
+        run: |
+          . venv/bin/activate
+          make citest