revert fatimage.yml changes

Author: bertiethorpe

.github/workflows/fatimage.yml

@@ -5,13 +5,13 @@ name: Build fat image
     inputs:
       ci_cloud:
         description: 'Select the CI_CLOUD'
-        required: false
-        type: string
+        required: true
+        type: choice
         default: ${{ vars.CI_CLOUD }}
         options:
-          - LEAFCLOUD
           - ARCUS
           - SMS
+          - LEAFCLOUD
 concurrency:
   group: ${{ github.ref }}-{{ matrix.os_version }}-{{ matrix.build }} # to branch/PR + OS + build
   cancel-in-progress: true