Add CI workflow to run pytest suite

.github/workflows/ci.yml

@@ -0,0 +1,40 @@
+name: CI
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["main"]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Julia
+        uses: julia-actions/setup-julia@v2
+        with:
+          version: "1.10" # Explicitly use the stable LTS
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install dependencies
+        run: pip install . pytest
+
+      - name: Initialize Julia via Python
+        run: python -c "import juliacall"
+        env:
+          # This tells juliapkg: "Don't download Julia, use the one I just installed"
+          PYTHON_JULIAPKG_EXE: julia 
+
+      - name: Run tests
+        run: pytest tests/
+        env:
+          PYTHON_JULIAPKG_EXE: julia
+          PYTHON_JULIAPKG_OFFLINE: "yes"