Unhelpful error message on missing dockerfile

[r2d4]

skaffold run on a skaffold.yaml with a bad or no dockerfile path.
This should be a more helpful error

Error: running skaffold steps: build: build step: running build for artifact: running build: docker build: error during connect: Post http://%2Fvar%2Frun%2Fdocker.sock/v1.35/build?buildargs=null&cachefrom=null&cgroupparent=&cpuperiod=0&cpuquota=0&cpusetcpus=&cpusetmems=&cpushares=0&dockerfile=Dockerfile&labels=null&memory=0&memswap=0&networkmode=&rm=0&shmsize=0&t=3eb2d543f44d746084540712facba63f&target=&ulimits=null: creating docker context: getting relative tar paths: opening dockerfile: Dockerfile: open Dockerfile: no such file or directory