Clarify region option & log the image actually used for deploy

action.yml

@@ -5,11 +5,6 @@ branding:
   icon: 'grid'
   color: 'purple'
 inputs:
-  region:
-    description: |
-      Scaleway region ID.
-    required: true
-    default: 'fr-par'
   container_id:
     description: |
       The UUID of the container.
@@ -33,6 +28,11 @@ inputs:
       The version of the API to compare against.
     required: false
     default: 'v1beta1'
+  region:
+    description: |
+      Scaleway region ID (one of `fr-par`, `nl-ams`, `pl-waw`).
+    required: false
+    default: 'fr-par'
   timeout:
     description: 'Timeout in minutes for the deployment'
     required: false
@@ -43,6 +43,7 @@ runs:
     - name: Update container with new image version
       shell: bash
       run: >
+        echo "Updating container image to ${{ inputs.registry_image_url }}"
         curl \
           --request PATCH \
           --header "X-Auth-Token: ${{ inputs.secret_key }}" \