Rename buildpacks-v3 task to buildpacks

The suffix v3 was a piece of buildpacks history, stemming from the initial start of the buildpacks concept, but isn't relevant to current consumers of the buildpacks task. To simplify it, and to fit with other task styles, we are removing v3

Additionally, we are updating the list of suggested builders, to reflect the current status of pack builders. NOTE: Paketo builders currently have a bug and don't work in Tekton, and until that issue is resolved, we aren't adding them in the list.

Signed-off-by: David Freilich <dfreilich@vmware.com>

task/buildpacks/0.1/README.md

@@ -3,7 +3,7 @@
 This build template builds source into a container image using [Cloud Native
 Buildpacks](https://buildpacks.io).
 
-The Cloud Native Buildpacks website describes v3 buildpacks as:
+The Cloud Native Buildpacks website describes buildpacks as:
 
 > ... pluggable, modular tools that translate source code into container-ready
 > artifacts such as OCI images. They replace Dockerfiles in the app development
@@ -15,21 +15,19 @@ The Cloud Native Buildpacks website describes v3 buildpacks as:
 ## Install the Task
 
 ```
-kubectl apply -f https://raw.githubusercontent.com/tektoncd/catalog/master/task/buildpacks-v3/0.1/buildpacks-v3.yaml
+kubectl apply -f https://raw.githubusercontent.com/tektoncd/catalog/master/task/buildpacks/0.1/buildpacks.yaml
 ```
 
 > **NOTE:** This task is currently only compatible with Tekton **v0.11.0** and above, and CNB Platform API 0.3 (lifecycle v0.7.0 and above). For previous Platform API versions, [see below](#previous-platform-api-versions).
 
 ## Parameters
 
-* **`BUILDER_IMAGE`**: The image on which builds will run. (must include v3 lifecycle and compatible buildpacks; _required_)
+* **`BUILDER_IMAGE`**: The image on which builds will run. (must include lifecycle and compatible buildpacks; _required_)
 
-* **`CACHE`**: The name of the persistent app cache volume. (_default:_ an empty
-  directory -- effectively no cache)
+* **`CACHE`**: The name of the persistent app cache volume. (_default:_ an empty directory -- effectively no cache)
 
 * **`PLATFORM_DIR`**: A directory containing platform provided configuration, such as environment variables.
-  Files of the format `/platform/env/MY_VAR` with content `my-value` will be translated by the lifecycle into
-  environment variables provided to buildpacks. For more information, see the [buildpacks spec](https://github.com/buildpacks/spec/blob/master/buildpack.md#provided-by-the-platform). (_default:_ an empty directory)
+  Files of the format `/platform/env/MY_VAR` with content `my-value` will be translated by the lifecycle into environment variables provided to buildpacks. For more information, see the [buildpacks spec](https://github.com/buildpacks/spec/blob/master/buildpack.md#provided-by-the-platform). (_default:_ an empty directory)
 
 * **`USER_ID`**: The user ID of the builder image user, as a string value. (_default:_ `"1000"`)
 
@@ -50,7 +48,7 @@ The `source` workspace holds the source to build. See `SOURCE_SUBPATH` above if
 
 ## Usage
 
-This `TaskRun` will use the `buildpacks-v3` task to build the source code, then publish a container image.
+This `TaskRun` will use the `buildpacks` task to build the source code, then publish a container image.
 
 ```
 apiVersion: tekton.dev/v1beta1
@@ -59,7 +57,7 @@ metadata:
   name: example-run
 spec:
   taskRef:
-    name: buildpacks-v3
+    name: buildpacks
   podTemplate:
     volumes:
 # Uncomment the lines below to use an existing cache
@@ -97,12 +95,11 @@ spec:
 
 ### Example builders
 
-Cloud Foundry:
- - `cloudfoundry/cnb:bionic`
- - `cloudfoundry/cnb:cflinuxfs3`
-
 Heroku:
- - `heroku/buildpacks:18`
+ - `heroku/buildpacks:18` → heroku-18 base image with buildpacks for Ruby, Java, Node.js, Python, Golang, & PHP
+
+Google:
+ - `gcr.io/buildpacks/builder:v1` → Ubuntu 18 base image with buildpacks for .NET, Go, Java, Node.js, and Python
 
 ## Previous Platform API Versions
 

task/buildpacks/0.1/buildpacks.yaml

@@ -2,7 +2,7 @@
 apiVersion: tekton.dev/v1beta1
 kind: Task
 metadata:
-  name: buildpacks-v3
+  name: buildpacks
   labels:
     app.kubernetes.io/version: "0.1"
   annotations:
@@ -22,7 +22,7 @@ spec:
 
   params:
     - name: BUILDER_IMAGE
-      description: The image on which builds will run (must include v3 lifecycle and compatible buildpacks).
+      description: The image on which builds will run (must include lifecycle and compatible buildpacks).
     - name: CACHE
       description: The name of the persistent app cache volume.
       default: empty-dir

task/buildpacks/0.1/tests/run.yaml

@@ -23,9 +23,9 @@ spec:
       value: ""
     - name: deleteExisting
       value: "true"
-  - name: buildpacks-v3
+  - name: buildpacks
     taskRef:
-      name: buildpacks-v3
+      name: buildpacks
     runAfter:
     - fetch-repository
     workspaces: