update workflow to build and add license filed

.github/workflows/deploy_pkg.yml

@@ -21,15 +21,15 @@ jobs:
       with:
         python-version: '3.12'
 
-    - name: Install dependencies
+    - name: Install build tools
       run: |
-        python -m pip install --upgrade pip
-        pip install --upgrade build
-        pip install -e .[dev,rdd]
+        python -m pip install --upgrade pip build twine
 
     - name: Build package
-      run: |
-        python -m build
+      run: python -m build
+
+    - name: Check package metadata
+      run: twine check dist/*
 
     - uses: actions/upload-artifact@v4
       with:

pyproject.toml

@@ -7,6 +7,7 @@ name = "DoubleML"
 version = "0.11.dev0"
 description = "Double Machine Learning in Python"
 readme = {file = "README.md", content-type = "text/markdown"}
+license = {file = "LICENSE"}
 authors = [
     {name = "Bach, P., Chernozhukov, V., Klaassen, S., Kurz, M. S., and Spindler, M."}
 ]