make sure hatch builds files before releasing

Author: dchukhin

.github/workflows/build.yml

@@ -32,6 +32,10 @@ jobs:
     permissions:
       id-token: write
     steps:
+    - name: Install hatch
+      run: pip install hatch
+    - name: Build a binary wheel and a source tarball
+      run: hatch build
     - name: Publish distribution to PyPI
       uses: pypa/gh-action-pypi-publish@release/v1
 
@@ -48,6 +52,10 @@ jobs:
       id-token: write  # IMPORTANT: mandatory for sigstore
 
     steps:
+    - name: Install hatch
+      run: pip install hatch
+    - name: Build a binary wheel and a source tarball
+      run: hatch build
     - name: Sign the dists with Sigstore
       uses: sigstore/gh-action-sigstore-python@v2.1.1
       with: