Fix setuptools in pyproject to include sub packages (#533)

* need to include sub packages manually

* avoid red cross on pushing tag

Author: ismael-mendoza

.github/workflows/publish.yml

@@ -102,6 +102,7 @@ jobs:
 
   publish-to-testpypi:
     name: Publish Python 🐍 distribution 📦 to TestPyPI
+    if: ${{ github.ref == 'refs/heads/main' }}
     needs:
     - build
     runs-on: ubuntu-latest

pyproject.toml

@@ -73,7 +73,7 @@ requires = ["setuptools>=61.0"]
 build-backend = "setuptools.build_meta"
 
 [tool.setuptools]
-packages = ["btk"]
+packages = ["btk", "btk.metrics"]
 
 [tool.ruff]
 # Exclude a variety of commonly ignored directories.