Update prepare-release.yml

Author: tortmayr

.github/workflows/prepare-release.yml

@@ -39,6 +39,29 @@ on:
         required: false
         type: boolean
         default: false
+  workflow_call:
+    inputs:
+      release_type:
+        description: 'Release type (major, minor, patch, next, or custom)'
+        required: true
+        type: string
+      custom_version:
+        description: 'Custom version (required if release_type is custom)'
+        required: false
+        type: string
+      release_repo:
+        description: 'GLSP repository to release'
+        required: true
+        type: string
+      branch:
+        description: 'Branch to use for the release repo (default: default branch)'
+        required: false
+        type: string
+      draft:
+        description: 'Create PR as draft'
+        required: false
+        type: boolean
+        default: false
 
 jobs:
   release: