skaffold dev examples/buildpacks fails on minikube

[balopat]

skaffold dev examples/buildpacks seems to work on GKE clusters but fails on minikube.

Expected behavior

Skaffold builds with buildpacks seemlessly to the local docker daemon of minikube.

Actual behavior

FATA[0025] exiting dev mode because first build failed: build failed: building [skaffold-buildpacks]: build artifact: tagging skaffold-buildpacks:latest->skaffold-buildpacks:v1.2.0-75-g4bd04bf5c-dirty: Error response from daemon: No such image: skaffold-buildpacks:latest 

Listing files to watch...
 - skaffold-buildpacks
Generating tags...
 - skaffold-buildpacks -> skaffold-buildpacks:v1.2.0-75-g4bd04bf5c-dirty
Checking cache...
 - skaffold-buildpacks: Not found. Building
Found [minikube] context, using local docker daemon.
Building [skaffold-buildpacks]...
latest: Pulling from heroku/buildpacks
Digest: sha256:2b19ebeef117238696b630c5bd3edc89dbaad661004a249708789c493019daa1
Status: Image is up to date for heroku/buildpacks:latest
18: Pulling from heroku/pack
Digest: sha256:2a25c77a3ee2ad3b52555e6ee99700f414e84add301bb0faf55bcd401acee281
Status: Image is up to date for heroku/pack:18
[detector] heroku/go       0.0.5.2
[detector] heroku/procfile 0.3
[restorer] Restoring cached layer 'heroku/go:shim'
[analyzer] Using cached layer 'heroku/go:shim'
[analyzer] Writing metadata for uncached layer 'heroku/go:profile'
[builder] -----> Fetching stdlib.sh.v8... done
[builder] -----> 
[builder]        Detected go modules via go.mod
[builder] -----> 
[builder]        Detected Module Name: github.com/GoogleContainerTools/skaffold/examples/buildpacks
[builder] -----> 
[builder]  !!    Using $GOVERSION override.
[builder]  !!         $GOVERSION = 1.13.1
[builder]  !!    
[builder]  !!    If this isn't what you want please run:'
[builder]  !!      heroku config:unset GOVERSION -a <app>
[builder]  !!    
[builder] -----> Using go1.13.1
[builder] -----> Determining packages to install
[builder]        
[builder]        Detected the following main packages to install:
[builder]                       github.com/GoogleContainerTools/skaffold/examples/buildpacks
[builder]        
[builder] -----> Running: go install -v -tags heroku github.com/GoogleContainerTools/skaffold/examples/buildpacks 
[builder] github.com/GoogleContainerTools/skaffold/examples/buildpacks
[builder]        
[builder]        Installed the following binaries:
[builder]                       ./bin/buildpacks
[builder]        
[builder]        Created a Procfile with the following entries:
[builder]                       web: bin/buildpacks
[builder]        
[builder]        If these entries look incomplete or incorrect please create a Procfile with the required entries.
[builder]        See https://devcenter.heroku.com/articles/procfile for more details about Procfiles
[builder]        
[builder] -----> Discovering process types
[builder]        Procfile declares types     -> web
[exporter] Adding layer 'app'
[exporter] Reusing layer 'config'
[exporter] Reusing layer 'launcher'
[exporter] Reusing layer 'heroku/go:profile'
[exporter] *** Images (9b3b8f104ef5):
[exporter]       index.docker.io/library/skaffold-buildpacks:latest
[cacher] Caching layer 'heroku/go:shim'
FATA[0025] exiting dev mode because first build failed: build failed: building [skaffold-buildpacks]: build artifact: tagging skaffold-buildpacks:latest->skaffold-buildpacks:v1.2.0-75-g4bd04bf5c-dirty: Error response from daemon: No such image: skaffold-buildpacks:latest 

Information

• Skaffold version: latest master
• Operating system: Mac OSX
• Contents of skaffold.yaml: examples/buildpacks

[balopat]

cc @dgageot, @briandealwis

[dgageot]

We should pass the docker api (that we discovered from the k8s context) to the pack library.
That will be easier when buildpacks/pack#471 is merged