👷 add GitHub action to build package.

.github/workflows/ci.yaml

@@ -0,0 +1,27 @@
+name: ci-build
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python: ["3.11", "3.12"]
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python }}
+      - name: Install dependencies
+        run: |
+            python -m pip install --upgrade pip
+      - name: Install reki
+        run: |
+            python -m pip install -e .
+      - name: Build
+        run: |
+            python -m build