Fix build-args

Signed-off-by: Andrea Mazzotti <[email protected]>

Author: anmazzotti

.github/workflows/publish-all-channels.yaml

@@ -38,6 +38,6 @@ jobs:
         with:
           context: .
           push: true
-          build-args:
-            - CHANNEL_JSON_FILE=${{ matrix.channel.file }}
+          build-args: |
+            CHANNEL_JSON_FILE=${{ matrix.channel.file }}
           tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ matrix.channel.tag }}