fix: query PyPI version before building in API check

The previous approach failed because it would show the dev version
after building current code. Now we query PyPI API directly before
building to get the actual latest stable release for comparison.

Author: RonnyPfannschmidt

.github/workflows/api-check.yml

@@ -31,19 +31,18 @@ jobs:
       - name: Install the latest version of uv
         uses: astral-sh/setup-uv@v6
 
+      - name: Get latest PyPI version
+        id: pypi-version
+        run: |
+          # Query PyPI for the latest stable version before building current code
+          LATEST_VERSION=$(curl -s https://pypi.org/pypi/setuptools-scm/json | python -c "import sys, json; print(json.load(sys.stdin)['info']['version'])")
+          echo "Latest PyPI version: $LATEST_VERSION"
+          echo "version=$LATEST_VERSION" >> $GITHUB_OUTPUT
+
       - name: Install dependencies
         run: uv sync --group test
 
       - name: Check API stability against PyPI
         run: |
-          # Get the latest version from PyPI
-          LATEST_VERSION=$(uv pip show setuptools-scm 2>/dev/null | grep "^Version:" | cut -d' ' -f2 || echo "")
-          if [ -z "$LATEST_VERSION" ]; then
-            echo "No PyPI version found, installing latest release..."
-            uv pip install setuptools-scm
-            LATEST_VERSION=$(uv pip show setuptools-scm | grep "^Version:" | cut -d' ' -f2)
-          fi
-          echo "Comparing against PyPI version: $LATEST_VERSION"
-
-          # Compare current code against PyPI version
-          uv run griffe check setuptools_scm -ssrc --verbose --against "setuptools-scm==$LATEST_VERSION"
+          echo "Comparing current code against PyPI version: ${{ steps.pypi-version.outputs.version }}"
+          uv run griffe check setuptools_scm -ssrc --verbose --against "setuptools-scm==${{ steps.pypi-version.outputs.version }}"