Fixes#4206 Followup to #4167
Extract common logic to load images into KinD, from `bin/kind-load`, `bin/install-pr`, `.github/workflows/kind_integration.yml` and `.github/workflows/release.yml`.
Besides removing the duplication, `bin/kind-load` will benefit in performance by having each image be loaded in parallel.
```
Load into KinD the images for Linkerd's proxy, controller, web, grafana, debug and cni-plugin.
Usage:
bin/kind-load [--images] [--images-host ssh://linkerd-docker]
Examples:
# Load images from the local docker instance
bin/kind-load
# Load images from tar files located in the current directory
bin/kind-load --images
# Retrieve images from a remote docker instance and then load them into KinD
bin/kind-load --images --images-host ssh://linkerd-docker
Available Commands:
--images: use 'kind load image-archive' to load the images from local .tar files in the current directory.
--images-host: the argument to this option is used as the remote docker instance from which images are first retrieved
(using 'docker save') to be then loaded into KinD. This command requires --images.
```
## Motivation
After #4147 added the `install-pr` script, installing PRs into existing
clusters does not work if that cluster is a KinD cluster
Changing the script to be able to use KinD, and specifically automate `kind
load` would be helpful!
## Solution
The script can now be used in the following ways.
```
❯ bin/install-pr --help
Install Linkerd with the changes made in a GitHub Pull Request.
Usage:
--context: The name of the kubeconfig context to use
# Install Linkerd into the current cluster
bin/install-pr 1234
# Install Linkerd into the current KinD cluster
bin/install-pr [-k|--kind] 1234
# Install Linkerd into the 'kind-pr-1234' KinD cluster
bin/install-pr [-k|--kind] --context kind-pr-1234 1234
```
The script assumes that the cluster (KinD or not) has already been created. If
the cluster is a KinD cluster, the `-k|--kind` flag should be passed.
If the `--context` flag is not passsed, the install defaults to the current
context (`kubectl config current-context`).
I also added a [`-h|--help]` option that describes how to use the script.
# Install PR
This script takes a Github pull request number as an argument, downloads the
docker images from the pull request's artifacts, pushes them, and installs
them on your Kubernetes cluster. Requires a Github personal access token
in the $GITHUB_TOKEN environment variable.
Signed-off-by: Alex Leong <alex@buoyant.io>
Alejandro Pedraza
Kevin Leimkuhler
Alex Leong