Merge pull request #179 from SupraSummus/ci

Configure github actions

.github/workflows/tests.yaml

@@ -0,0 +1,25 @@
+name: Run tests
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [
+          "3.7", "3.8",
+          "pypy3.9",
+        ]
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: pip install pillow
+      - name: Run tests
+        run: python tests/alltests.py