add workflow_dispatch type to publish container action

Author: SarahAlidoost

.github/workflows/publish-container.yml

@@ -4,6 +4,7 @@ name: Create and publish the PyStemmusScope container image 📦
 on:
   release:
     types: [published]
+  workflow_dispatch:
 
 # Defines two custom environment variables for the workflow. These are used for the Container registry domain, and a name for the Docker image that this workflow builds.
 env: