chore: updates to the content API (for use in CIBUS)

base/blocks.py

@@ -1,3 +1,4 @@
+from wagtail.api import APIField
 from wagtail.blocks import (
     CharBlock,
     ChoiceBlock,
@@ -14,6 +15,13 @@ class ImageBlock(StructBlock):
     caption = CharBlock(required=False)
     attribution = CharBlock(required=False)
 
+    api_fields = [
+        APIField('image'),
+        # Adds a URL to a rendered thumbnail of the image to the API
+        APIField('caption'),
+        APIField('attribution'),
+    ]
+
     class Meta:
         icon = "image"
         template = "base/blocks/image_block.html"