Build container images in Kubernetes using Knative

apiVersion: build.knative.dev/v1alpha1
kind: BuildTemplate
metadata:
  name: function-runtime
spec:
  parameters:
  - name: IMAGE
    description: The URI of the image to push, including registry host
  - name: HANDLER
    description: The import used to load the handler
    default: "handler.js"
  steps:
  - name: dockerfile
    image: gcr.io/kaniko-project/executor:debug
    command:
    - /busybox/sh
    args:
    - -c
    - |
      cat <<EOF >> Dockerfile
      FROM docker-registy.local/our-function-runtime:latest
      COPY . .
      ENV HTTP_HANDLER=${HANDLER}
      EOF
  - name: export
    image: gcr.io/kaniko-project/executor
    args:
    - --destination=${IMAGE}

apiVersion: pipeline.knative.dev/v1alpha1
kind: Task
metadata:
  name: function-build
spec:
  inputs:
    resources:
    - name: workspace
      type: git
    params:
    - name: handler
      description: The import used to load the handler
      default: "handler.js"
  outputs:
    resources:
    - name: builtImage
      type: image
  steps: ...

  steps:
  - name: dockerfile
    ...
      ENV HTTP_HANDLER=${inputs.params.handler}
    ...
  - name: export
    ...
    - --destination=${outputs.resources.builtImage.url}

$ kubectl describe taskrun nodejs-riff
Name: nodejs-riff
...
Status:
Conditions:
Last Transition Time: 2018-12-04T14:08:25Z
Message: couldn't retrieve referenced input PipelineResource "nodejs-riff-module-git": pipelineresource.pipeline.knative.dev "nodejs-riff-module-git" not found

$ kubectl get pods
NAME                     READY   STATUS     RESTARTS   AGE
nodejs-riff-pod-0e9f40   0/1     Init:4/5   0          24s

$ kubectl logs nodejs-riff-pod-0e9f40 -c build-step-build-and-push
INFO[0000] Downloading base image projectriff/node-function-invoker@sha256:ae7f87c524bb46dbfd7acc986b827f74d93d1301ea137f52734c7607295a919c 
...
INFO[0011] COPY . ${FUNCTION_URI}                       
INFO[0011] Taking snapshot of files...                  
...
2018/12/04 14:11:50 pushed blob sha256:4ccf8f766ca3c8bac929d3cf316001a7d3255ce6c067b0465294254b27b7ae17
2018/12/04 14:11:50 knative.registry.svc.cluster.local/knative-training/nodejs-riff-module:latest: digest: sha256:b72354b6af226e0aef7524a8e2bd8340e6fd3e209760b0dfc1abafbd1341a04a size: 1886