Simplify custom builder example

integration/examples/custom/README.adoc

@@ -8,6 +8,7 @@ This is a simple example based on
 * *deploying* a single container pod using `kubectl`
 
 ## Before you begin
+
 For this tutorial to work, you will need to have Skaffold and a Kubernetes cluster set up.
 To learn more about how to set up Skaffold and a Kubernetes cluster, see the https://skaffold.dev/docs/getting-started[getting started docs].
 
@@ -27,30 +28,18 @@ $ git clone https://github.com/GoogleContainerTools/skaffold
 $ cd skaffold/examples/buildpacks
 ```
 
-Set the default buildpack to one that can build Go applications: 
-
-``` shell
-$ pack set-default-builder heroku/buildpacks
-```
-
-
-
 Take a look at the `build.sh` file, which uses `pack` to containerize source code with buildpacks:
 
 ```shell
 $ cat build.sh
-#!/bin/bash
+#!/usr/bin/env bash
 set -e
-images=$(echo $IMAGES | tr " " "\n")
-
-for image in $images
-do
-    pack build $image
-    if $PUSH_IMAGE
-    then
-        docker push $image
-    fi
-done
+
+pack build --builder=heroku/buildpacks $IMAGE
+
+if $PUSH_IMAGE; then
+    docker push $IMAGE
+fi
 ```
 
 and the skaffold config, which configures artifact `gcr.io/k8s-skaffold/skaffold-example` to build with `build.sh`:
@@ -64,13 +53,6 @@ build:
   - image: gcr.io/k8s-skaffold/skaffold-example
     custom:
       buildCommand: ./build.sh
-      dependencies:
-        paths:
-        - .
-deploy:
-  kubectl:
-    manifests:
-      - k8s-*
 ```
 For more information about how this works, see the Skaffold custom builder https://skaffold.dev/docs/how-tos/builders/#custom-build-script-run-locally[documentation].
 
@@ -79,13 +61,14 @@ Now, use Skaffold to deploy this application to your Kubernetes cluster:
 ```shell
 $ skaffold run --tail --default-repo <your repo>
 ```
+
 With this command, Skaffold will build the `skaffold-example` artifact with buildpacks and deploy the application to Kubernetes.
 You should be able to see "Hello, World!" printed every second in the Skaffold logs.
 
 To clean up your Kubernetes cluster, run:
 
 ```shell
-$ skaffold delete --default-repo <your repo>
+$ skaffold delete
 ```
 
 ifndef::env-github[]

integration/examples/custom/build.sh

@@ -1,11 +1,8 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -e
-image=$(echo $IMAGE)
 
-if [ ! -z "$image" ]; then
-  pack build $image
-  if $PUSH_IMAGE
-  then
-    docker push $image
-  fi
+pack build --builder=heroku/buildpacks $IMAGE
+
+if $PUSH_IMAGE; then
+    docker push $IMAGE
 fi

integration/examples/custom/skaffold.yaml

@@ -5,10 +5,3 @@ build:
   - image: gcr.io/k8s-skaffold/skaffold-example
     custom:
       buildCommand: ./build.sh
-      dependencies:
-        paths:
-        - .
-deploy:
-  kubectl:
-    manifests:
-      - k8s-*