chore: allow to trigger integration tests manually

Relate to #13

Author: php-coder

.github/workflows/integration-tests.yml

@@ -2,6 +2,8 @@ name: Integration Tests
 
 on:
   push:
+  # https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#onworkflow_dispatch
+  workflow_dispatch:
 
 # https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#permissions
 permissions: