ci: build hatch on tag pushed

ultrabug#26

.github/workflows/ci.yml

@@ -23,9 +23,9 @@ jobs:
             py: pypy3
 
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v3
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
@@ -38,3 +38,22 @@ jobs:
         run: make test
         shell: bash
 
+  build_package:
+    needs: test
+    runs-on: ubuntu-latest
+    if: startsWith(github.ref, 'refs/tags/')
+    steps:
+      - uses: actions/checkout@v3
+      - name: Setup Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.11'
+      - name: Install Hatch
+        run: |
+          python -m pip install -U hatch
+      - name: Build package
+        run: |
+          hatch build
+      - name: Publish
+        run: |
+          hatch publish