Update ci.yaml

When trying to use the docker image built by the pipeline for lambda it fails with this error The image manifest or layer media type for the source image 305686791668.dkr.ecr.ap-southeast-2.amazonaws.com/auto-scheduler:main-e3745b8 is not supported.

this always happens on the main branch for some reason as it was not encountered with the test tag but nevertheless here is the issue on github:
docker/buildx#1509 (comment)
exercism/github-actions#113

.github/workflows/ci.yaml

@@ -317,6 +317,7 @@ jobs:
           file: Dockerfile
           cache-from: type=gha
           cache-to: type=gha, mode=max
+          provenance: false
           push: true
           # Default to just the git short hash. if docker-tag-latest ; also tag as the latest image
           tags: ${{inputs.docker-repository}}:${{inputs.docker-prefix && format('{0}-', inputs.docker-prefix) || ''}}${{env.GIT_SHORT_HASH}}${{inputs.docker-tag-latest && format(',{0}:latest',inputs.docker-repository)|| ''}}