Enable publishing to test PyPI

.github/workflows/release.yaml

@@ -1,6 +1,15 @@
 name: Release
 on:
   workflow_dispatch:
+    inputs:
+      pypi:
+        description: 'PyPI instance'
+        required: true
+        type: choice
+        default: 'production'
+        options:
+          - production
+          - testing
   push:
     branches: [ release ]
 
@@ -11,6 +20,8 @@ concurrency:
 env:
   PYTHON_RUNTIME_VERSION: "3.11"
   PYTHON_PACKAGE_NAME: netboxlabs-netbox-branching
+  PYPI_URL_PRODUCTION: "https://upload.pypi.org/legacy/"
+  PYPI_URL_TESTING: "https://test.pypi.org/legacy/"
 
 jobs:
   get-package-name:
@@ -95,6 +106,7 @@ jobs:
       - name: Publish release distributions to PyPI
         uses: pypa/gh-action-pypi-publish@release/v1
         with:
+          repository-url: ${{ github.event.inputs.pypi == 'production' && env.PYPI_URL_PRODUCTION || env.PYPI_URL_TESTING }}
           packages-dir: dist
   release:
     name: Release