Adding new v4 validator action

.github/workflows/validate.yml

@@ -0,0 +1,23 @@
+name: validate
+
+on:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    env:
+      BUNDLE_WITH: test jekyll_plugins
+      SITE_ID:  'cookbook' # which iiif site this is
+      URL: 'https://preview.iiif.io'
+
+    steps:
+      - name: Check out this repository
+        uses: actions/checkout@v5
+
+      - name: Run IIIF validator
+        uses: IIIF/presentation-validator@main
+        with:
+          directory: source/presentation/4.0/example/
+          version: "4.0"

source/presentation/4.0/example/uc06_canvas_in_scene.json

@@ -54,7 +54,10 @@
                                                         "width": 800,
                                                         "height": 800
                                                     },
-                                                    "target": "https://iiif.io/api/presentation/4.0/example/uc06/canvas/chessboard"
+                                                    "target": {
+                                                        "id": "https://iiif.io/api/presentation/4.0/example/uc06/canvas/chessboard",
+                                                        "type": "Canvas"
+                                                    }
                                                 }
                                             ]
                                         }

source/presentation/4.0/example/uc07_duration_composite.json

@@ -10,7 +10,7 @@
             "label": { "en": [ "Side A: 99 Luftballons - 10min duration" ] },
             "width": 100,
             "height": 100,
-            "duration": 36000,
+            "duration": 600,
             "items": [
                 {
                     "id": "https://iiif.io/api/presentation/4.0/example/uc07_audio/canvas/1/page/1",