fix: Pass version to cibuildwheel via SETUPTOOLS_SCM_PRETEND_VERSION

Inside cibuildwheel containers, git tags aren't visible so setuptools_scm
falls back to 0.0.0. Fix by extracting version from git tag before building
and passing it via environment variable.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: wmayner

.github/workflows/build_wheels.yml

@@ -26,11 +26,20 @@ jobs:
         with:
           python-version: '3.12'
 
+      - name: Get version from git tag
+        id: version
+        run: |
+          VERSION=$(git describe --tags --abbrev=0 | sed 's/^v//')
+          echo "version=$VERSION" >> $GITHUB_OUTPUT
+          echo "Building version: $VERSION"
+
       - name: Install cibuildwheel
         run: pip install cibuildwheel>=3.0
 
       - name: Build wheels
         run: cibuildwheel --output-dir wheelhouse
+        env:
+          CIBW_ENVIRONMENT: "SETUPTOOLS_SCM_PRETEND_VERSION=${{ steps.version.outputs.version }}"
 
       - uses: actions/upload-artifact@v4
         with:

.github/workflows/make_sdist.yml

@@ -21,10 +21,19 @@ jobs:
       with:
         python-version: '3.12'
 
+    - name: Get version from git tag
+      id: version
+      run: |
+        VERSION=$(git describe --tags --abbrev=0 | sed 's/^v//')
+        echo "version=$VERSION" >> $GITHUB_OUTPUT
+        echo "Building version: $VERSION"
+
     - name: Build source distribution
       run: |
         pip install build
         python -m build --sdist
+      env:
+        SETUPTOOLS_SCM_PRETEND_VERSION: ${{ steps.version.outputs.version }}
 
     - uses: actions/upload-artifact@v4
       with: