Add a builder for applications

Applications are built using the Cloud Foundery CNB builder,
cloudfoundry/cnb:bionic.

cf-cnb-clusterbuildtemplate.yaml

@@ -0,0 +1,92 @@
+apiVersion: build.knative.dev/v1alpha1
+kind: ClusterBuildTemplate
+metadata:
+  name: cf-cnb
+spec:
+  parameters:
+    - name: IMAGE
+      description: The image you wish to create. For example, "repo/example", or "example.com/repo/image".
+    - name: RUN_IMAGE
+      description: The run image buildpacks will use as the base for IMAGE.
+      default: packs/run:0.1.0
+    - name: BUILDER_IMAGE
+      description: The builder image provides the buildpacks that will build the IMAGE from source.
+      default: cloudfoundry/cnb:bionic
+    - name: USE_CRED_HELPERS
+      description: Use Docker credential helpers for Google's GCR, Amazon's ECR, or Microsoft's ACR.
+      default: 'true'
+    - name: USER_ID
+      description: The user ID of the builder image user
+      default: "1000"
+    - name: GROUP_ID
+      description: The group ID of the builder image user
+      default: "1000"
+    - name: CACHE
+      description: The name of the volume to use for the build cache.
+      default: empty-dir
+  steps:
+    - name: prepare
+      image: ubuntu:18.04
+      command: ["/bin/sh"]
+      args:
+        - "-c"
+        - >
+          chown -R "${USER_ID}:${GROUP_ID}" "/builder/home" &&
+          chown -R "${USER_ID}:${GROUP_ID}" /layers &&
+          chown -R "${USER_ID}:${GROUP_ID}" /workspace
+      volumeMounts:
+        - name: ${CACHE}
+          mountPath: /layers
+      imagePullPolicy: Always
+    - name: detect
+      image: ${BUILDER_IMAGE}
+      command: ["/lifecycle/detector"]
+      args:
+        - "-app=/workspace"
+        - "-group=/layers/group.toml"
+        - "-plan=/layers/plan.toml"
+      volumeMounts:
+        - name: ${CACHE}
+          mountPath: /layers
+      imagePullPolicy: Always
+    - name: analyze
+      image: ${BUILDER_IMAGE}
+      command: ["/lifecycle/analyzer"]
+      args:
+        - "-layers=/layers"
+        - "-helpers=${USE_CRED_HELPERS}"
+        - "-group=/layers/group.toml"
+        - "${IMAGE}"
+      volumeMounts:
+        - name: ${CACHE}
+          mountPath: /layers
+      imagePullPolicy: Always
+    - name: build
+      image: ${BUILDER_IMAGE}
+      command: ["/lifecycle/builder"]
+      args:
+        - "-layers=/layers"
+        - "-app=/workspace"
+        - "-group=/layers/group.toml"
+        - "-plan=/layers/plan.toml"
+      volumeMounts:
+        - name: ${CACHE}
+          mountPath: /layers
+      imagePullPolicy: Always
+    - name: export
+      image: ${BUILDER_IMAGE}
+      command: ["/lifecycle/exporter"]
+      args:
+        - "-layers=/layers"
+        - "-helpers=${USE_CRED_HELPERS}"
+        - "-app=/workspace"
+        - "-image=${RUN_IMAGE}"
+        - "-group=/layers/group.toml"
+        - "${IMAGE}"
+      volumeMounts:
+        - name: ${CACHE}
+          mountPath: /layers
+      imagePullPolicy: Always
+  volumes:
+    - name: empty-dir
+      emptyDir: {}