Add GitHub unit test workflow

Author: pont-us

.github/workflows/tests.yaml

@@ -0,0 +1,31 @@
+name: Python package
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.11", "3.12"]
+
+    steps:
+    - uses: actions/checkout@v4
+    - uses: mamba-org/setup-micromamba@v2
+      with:
+        environment-file: environment.yml
+        init-shell: >-
+          bash
+        cache-environment: false
+        create-args: python=${{ matrix.python-version }}
+        post-cleanup: 'all'
+    - name: Print Python version
+      run: |
+        python --version
+    - name: Run pytest
+      run: |
+        pytest