fix(actions): let kubeconform use custom CRDs and ignore unknown ones

.forgejo/workflows/validate.yaml

@@ -17,4 +17,10 @@ jobs:
 
       - name: Validate manifests
         run: |
-          kubeconform -strict -summary ./manifests/
+          kubeconform \
+            -strict \
+            -summary \
+            -ignore-missing-schemas \
+            -schema-location default \
+            -schema-location 'https://raw.githubusercontent.com/datreeio/CRDs-catalog/main/{{.Group}}/{{.ResourceKind}}_{{.ResourceAPIVersion}}.json' \
+            ./manifests/