another try for weird gh action behaviour

Author: john30

.github/workflows/preparerelease.yml

@@ -7,13 +7,13 @@ on:
     branches: [ master ]
     paths:
       - 'VERSION'
+      - '.github/workflows/preparerelease.yml'
   workflow_dispatch:
     inputs:
       limitarch:
         description: Limit to this architecture
         required: false
         type: choice
-        default: ''
         options:
           - ''
           - amd64
@@ -24,7 +24,6 @@ on:
         description: Limit to this image
         required: false
         type: choice
-        default: ''
         options:
           - ''
           - bullseye