feat: allow manual activation of docker image deployment

.github/workflows/docker-release.yml

@@ -3,6 +3,7 @@ name: Create and publish a Docker 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: