ci: add build workflow

.github/workflows/build.yml

@@ -0,0 +1,30 @@
+name: Build
+
+on: push
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    environment: release
+    permissions:
+      contents: write
+      id-token: write
+    steps:
+      - uses: actions/checkout@v4
+      - uses: pdm-project/setup-pdm@v3
+      - name: Build
+        run: pdm build
+      - uses: actions/upload-artifact@v4
+        with:
+          name: dist
+          path: dist
+          if-no-files-found: error
+      - name: Release
+        uses: softprops/action-gh-release@v2
+        if: startswith(github.ref, 'refs/tags/v')
+        with:
+          files: dist/*
+          generate_release_notes: true
+      - name: Publish to PyPI
+        if: startswith(github.ref, 'refs/tags/v')
+        run: pdm publish --no-build