Update .github/workflows/python-package.yml

Include the manual dispatch trigger, in case we'd ever want to run the CI manually

Co-authored-by: Jaap de Ruyter van Steveninck <32810691+deruyter92@users.noreply.github.com>

Author: C-Achard

.github/workflows/python-package.yml

@@ -5,6 +5,7 @@ name: Build, validate & Release
 # - For releases: when you push a tag like v1.2.3, this workflow runs the full matrix validation, then builds the release artifacts, and finally publishes to PyPI if all checks pass.
 
 on:
+  workflow_dispatch:
   # Release pipeline: run only when pushing a version-like tag (e.g. v1.2.3)
   # Test pipeline: run tests on main/master pushes & pull requests AND tags.
   push: