Extend build workflow to publish the package

This includes a simple set of checks to ensure the tag matches the
version of the package and is mentioned in the changelog.

.github/workflows/build_and_publish.yaml

@@ -0,0 +1,58 @@
+name: build and publish
+
+on:
+  pull_request:
+  push:
+    tags:
+      - v*
+
+# Only allow one instance of this workflow for each PR.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref_name }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-24.04
+    timeout-minutes: 5
+
+    steps:
+    - uses: actions/checkout@v4
+    - uses: hynek/build-and-inspect-python-package@v2
+
+  verify:
+    runs-on: ubuntu-24.04
+    # if: github.repository_owner == 'kraken-tech' && github.ref_type == 'tag'
+    timeout-minutes: 5
+
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/setup-python@v5
+      with:
+        python-version-file: '.github/workflows/.python-version'
+        cache: 'pip'
+    - run: python -m pip install .
+    - id: package_version
+      run: echo "version=$(python -c "from importlib.metadata import version; print(version('datetime-tools'))")" >> $GITHUB_OUTPUT
+    - name: check package version matches tag
+      run: |
+        [ "v{{ steps.package_version.outputs.version }}" = "{{ github.ref_name }}"]
+    - name: check changelog includes version
+      run: grep {{ github.ref_name }} < CHANGELOG.md
+
+  publish:
+    environment: publish
+    if: github.repository_owner == 'kraken-tech' && github.ref_type == 'tag'
+    needs: [build, verify]
+    runs-on: ubuntu-24.04
+    timeout-minutes: 5
+
+    permissions:
+      id-token: write
+
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          name: Packages
+          path: dist
+      - uses: pypa/gh-action-pypi-publish@release/v1