build(workflows): add run tests workflow to the project

Fixes: #5

.github/workflows/run_tests.yml

@@ -0,0 +1,27 @@
+name: Run peasant tests
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    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: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: |
+          pip install --upgrade pip
+          pip install -r requirements/basic.txt
+          pip install -r requirements/all.txt
+          pip install -r requirements/tests.txt
+      - name: Run python unit tests
+        run: |
+          PYTHONPATH=$PYTHONPATH:. python tests/runtests.py