Simplify build

Author: gentlegiantJGC

.github/workflows/python-build.yml

@@ -12,8 +12,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [ '3.11', '3.12' ]
-        os: [ macos-15, windows-2025 ]
+        python-version: [ '3.12' ]
+        os: [ ubuntu-24.04 ]
 
     runs-on: ${{ matrix.os }}
     defaults:
@@ -36,7 +36,7 @@ jobs:
 
     - name: Build
       run: |
-        python -m build .
+        python -m build --sdist .
 
     - name: Publish
       env: