Added a pypi publish job to Github Actions

Author: phw

.github/workflows/build.yaml

@@ -31,3 +31,29 @@ jobs:
       with:
         name: dist-${{ matrix.python-version }}
         path: dist/
+
+  pypi-publish:
+    name: upload release to PyPI
+    if: startsWith(github.ref, 'refs/tags/')
+    runs-on: ubuntu-latest
+    needs: test
+    # Specifying a GitHub environment is optional, but strongly encouraged
+    environment:
+      name: pypi
+      url: https://pypi.org/p/discid
+    permissions:
+      # IMPORTANT: this permission is mandatory for Trusted Publishing
+      id-token: write
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: 3.9
+        cache: 'pip'
+    - name: Install dependencies
+      run: pip install build
+    - name: Build
+      run: python -m build --sdist .
+    - name: Publish package distributions to PyPI
+      uses: pypa/gh-action-pypi-publish@release/v1