CI: add workflow to build package

.github/workflows/build.yml

@@ -0,0 +1,16 @@
+name: build
+on: [push, pull_request]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v4
+        with:
+          python-version: 3
+      - run: pip install build
+      - run: python -m build .
+      - uses: actions/upload-artifact@v4
+        with:
+          name: dist
+          path: dist