Update pyrad_tests_base.yml

Author: wolfidan

.github/workflows/pyrad_tests_base.yml

@@ -9,7 +9,8 @@ on:
     branches: [ master ]
   pull_request:
     branches: [ master ]
-
+  workflow_dispatch:
+  
 jobs:
   unit_tests:
     name: Unit Tests (${{ matrix.python-version }}, ${{ matrix.os }})