Set provenance to false on docker/build-push-action

Builds were failing with the error:

> OCI index found, but Accept header does not support OCI indexes

The suggested fix is to temporarily disable provenance until better
support for OCI indexes arrives.

docker/buildx#1533

.github/workflows/deploy_to_dev.yml

@@ -46,6 +46,7 @@ jobs:
           push: true
           tags: dfedigital/early-careers-framework-dev:builder
           target: builder
+          provenance: false
 
       - name: Build and push docker image from early-careers-framework-gems-node-modules target
         uses: docker/build-push-action@v2