add regression test workflow

.github/workflows/regression.yml

@@ -0,0 +1,38 @@
+name: run tests and check coverage
+
+on: push
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout repo content
+        uses: actions/checkout@v2 # checkout the repository content
+
+      - name: setup python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.10' # install the python version needed
+
+      - name: install python packages
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt
+
+      - name: run pytest
+        id: test_step
+        run: pytest tests
+
+      - name: Fail workflow if tests were failed
+        if: ${{ steps.test_step.outcome == 'failure' }}
+        run: exit 1
+
+      - name: run coverage
+        id: test_cov_step
+        run: |
+          coverage run -m pytest tests
+          coverage report -m | awk '/TOTAL/ {print ($4 > 70)}'
+
+      - name: Fail workflow if test coverage score is below threshold
+        if: ${{ steps.test_cov_step.outcome == 0 }}
+        run: exit 1