Publish package to pypi for tags only, and to testpypi for develop only

Author: olivhoenen

.github/workflows/publish.yml

@@ -27,6 +27,7 @@ jobs:
 
   publish-to-pypi:
     name: Publish IMAS-Python distribution to PyPI
+    if: startsWith(github.ref, 'refs/tags/')  # only publish to PyPI on tag pushes
     needs:
     - build
     runs-on: ubuntu-latest
@@ -46,6 +47,7 @@ jobs:
 
   publish-to-testpypi:
     name: Publish IMAS-Python distribution to TestPyPI
+    if: github.ref=='refs/heads/develop'  # only publish to TestPyPI on develop pushes
     needs:
     - build
     runs-on: ubuntu-latest
@@ -64,4 +66,4 @@ jobs:
       uses: pypa/gh-action-pypi-publish@unstable/v1
       with:
         repository-url: https://test.pypi.org/legacy/
-        verbose: true
+        verbose: true