Provide type for inputs for re-usable workflow

.github/workflows/eclipse-distro-build.yml

@@ -1,17 +1,23 @@
 name: Eclipse Distro STS Build
 
 on:
-#  workflow_dispatch:
+  workflow_dispatch:
   workflow_call:
     inputs:
       eclipse_profile:
         description: Eclipse profile 'e428' etc
         required: true
         default: 'e428'
+        type: string
       build_type:
         description: Build type such as 'snapshot', 'milestone' or 'release'
         required: true
         default: 'snapshot'
+        type: choice
+        options:
+          - snapshot
+          - milestone
+          - release
 
 jobs: