reformat build args

Author: jameslamb

.github/workflows/publish-images.yaml

@@ -34,9 +34,9 @@ jobs:
         with:
           context: .
           file: ./Dockerfile-notebook-base
-          build-args:
-            DASK_VERSION: "2025.7.0"
-            PYTHON_VERSION: "3.13"
+          build-args: |
+            DASK_VERSION=2025.7.0
+            PYTHON_VERSION=3.13
           push: true
           tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME}}-notebook-base
           #labels: ${{ steps.meta.outputs.labels }}