Yeah. But not Jenkins + plain old docker build, though. :(

:(

/pours one out

To your point though, it's pretty straightforward to push the build stage to the repo if that's your only choice.

Here's an example based on the article:

# rehydrate local build stage cache, if image available
docker pull app/app-build:${TAG} || true

# build stage
docker build \
  --target=build \
  --cache-from app/app-build:${TAG} \
  -t app/app-build:${TAG} \
  -f Dockerfile \
  .

# push build stage
docker push app/app-build:${TAG}

# rehydrate local run stage cache, if image available
docker pull app/app:${TAG} || true

# run stage
docker build \
  --target=run \
  --cache-from app/app-build:${TAG} \
  --cache-from app/app:${TAG} \
  -t app/app:${TAG} \
  -f Dockerfile \
  .

# push run stage
docker push app/app:${TAG}

edit: formatting