Merge pull request #3 from codesphere-cloud/clemens/workflow-dispatch

chore(ci): allow manual trigger

Author: clemensfreitagdev

.github/workflows/preview.yaml

@@ -1,6 +1,7 @@
 name: Create Codesphere Workspace on PR
 
 on:
+  workflow_dispatch: # Allows manual triggering of the workflow from the Actions tab
   pull_request:
     types: [opened, reopened, synchronize] # Triggers when a PR is opened, reopened, or new commits are pushed to it