docker buildx have different output depending on the driver used

[joaopapereira]

What steps did you take:
when running kbld with a docker buildx configuration if the builder is not kubernetes it fails to push the images.

What happened:

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: kbld-test1
spec:
  selector:
    matchLabels:
      app: kbld-test1
  template:
    metadata:
      labels:
        app: kbld-test1
    spec:
      containers:
      - name: my-app
        image: simple-app
---
apiVersion: kbld.k14s.io/v1alpha1
kind: Config
sources:
- image: simple-app
  path: dev-util
  docker:
    buildx:
      rawoptions:
      - --platform
      - linux/amd64
destinations:
- image: simple-app
  newImage: docker.io/rkamaldocker/simple-app

Error:

kbld: Error:
- Resolving image 'simple-app': Expected to find image digest in build output but did not

What did you expect:
No error

Anything else you would like to add:
This is what kbld is looking for in the output of buildx: pushing manifest for .*@sha256:([0-9a-z]+)
but in this case you have
pushing [docker.io/rkamaldocker/simple-app:rand-169723384850284148-1834444161104-simple-app](http://docker.io/rkamaldocker/simple-app:rand-169723384850284148-1834444161104-simple-app) with docker

Environment:

• kbld version (use kbld --version): All
• Docker registry used (e.g. Docker HUB): NA
• OS (e.g. from /etc/os-release): All

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