CI: Add a basic test

.github/workflows/build_test.yml

@@ -0,0 +1,27 @@
+name: Build and Test
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.9"]
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+      - uses: actions/checkout@v3
+      - name: Build and test
+        run: |
+          pip install -e .
+          pip install asv virtualenv
+          asv run