Update PyPI workflow

Author: IgnacioJPickering

.github/workflows/deploy-pypi.yaml

@@ -21,8 +21,6 @@ on:
 env:
   PYTHON_VERSION: '3.11'
   SETUPTOOLS_SCM_PRETEND_VERSION: ${{ github.event_name == 'release' && github.event.release.tag_name || github.event.inputs.version }}
-  UPLOAD_PYPI: ${{ github.event_name != 'release' && github.event.inputs.upload-pypi || 'true' }}
-  UPLOAD_TESTPYPI: ${{ github.event_name != 'release' && github.event.inputs.upload-testpypi || 'false' }}
 
 jobs:
   build_package:
@@ -59,7 +57,7 @@ jobs:
   publish_to_testpypi:
     needs: build_package
     runs-on: ubuntu-latest
-    if: ${{ env.UPLOAD_TESTPYPI == 'true' }}
+    if: ${{ github.event_name != 'release' && github.event.inputs.upload-testpypi }}
     environment:
       name: testpypi
       url: https://test.pypi.org/p/torchani-dev-test
@@ -80,7 +78,7 @@ jobs:
   publish_to_pypi:
     needs: build_package
     runs-on: ubuntu-latest
-    if: ${{ env.UPLOAD_PYPI == 'true' }}
+    if: ${{ github.event_name == 'release' || github.event.inputs.upload-pypi }}
     environment:
       name: pypi
       url: https://pypi.org/p/torchani