[preview] rename preview-install to local-preview

This PR updates the new preview installation method, to be
called `local-preview`. This is part of the recent change
across the documentation https://github.com/gitpod-io/website/pull/2326

The image tag is still `preview-install` in the readme's and other
documentations, but it will be updated once we start publishing
releases with it.

Signed-off-by: Tarun Pothulapati <[email protected]>

Author: Pothulapati

install/preview/BUILD.yaml

@@ -14,4 +14,4 @@ packages:
     config:
       dockerfile: leeway.Dockerfile
       image:
-        - ${imageRepoBase}/preview-install:${version}
+        - ${imageRepoBase}/local-preview:${version}

install/preview/README.md

@@ -1,4 +1,4 @@
-# Gitpod Preview Installation
+# Gitpod Local Preview
 
 This repo helps users to try out and preview self-hosted Gitpod **locally** without all the things
 needed for a production instance. The aim is to provide an installation mechanism as minimal and
@@ -7,7 +7,7 @@ simple as possible.
 ## Installation
 
 ```bash
-docker run --privileged --name gitpod --rm -it -v /tmp/gitpod:/var/gitpod eu.gcr.io/gitpod-core-dev/build/preview-install:tar-preview-output.2
+docker run --privileged --name gitpod --rm -it -v /tmp/gitpod:/var/gitpod eu.gcr.io/gitpod-core-dev/build/preview-install
 ```
 
 Once the above command starts running and the pods are ready (can be checked by running `docker exec gitpod kubectl get pods`),