docs: update testing wiki

- includes docs on how to deploy a local EUI package in Kibana

wiki/contributing-to-eui/testing/testing-in-kibana.md

@@ -23,9 +23,32 @@ yarn kbn bootstrap --no-validate && yarn start
 ```
 
 * The `--no-validate` flag is required when bootstrapping with a `.tgz`.
-  * Change the name of the `.tgz` after subsequent `yarn build && yarn pack` steps (e.g., `elastic-eui-xx.x.x-1.tgz`, `elastic-eui-xx.x.x-2.tgz`). This is required for `yarn` to recognize new changes to the package.
+  * Change the name of the `.tgz` after subsequent `yarn build-pack` steps (e.g., `elastic-eui-xx.x.x-1.tgz`, `elastic-eui-xx.x.x-2.tgz`). This is required for `yarn` to recognize new changes to the package.
 * Running Kibana with `yarn start` ensures it starts in dev mode and doesn't use a previously cached version of EUI.
 
+### Deploying local EUI in Kibana
+
+If you want to deploy a local EUI package in Kibana you can do the following:
+
+#### Generate and link a local EUI package
+
+- Follow the steps above to create a local package of EUI using `yarn build-pack`
+- Copy the generated `.tgz` package file to the Kibana root
+- Point the `package.json` file in Kibana to that local file: `"@elastic/eui": "./elastic-eui-xx.x.x.tgz"`.
+- Run `yarn kbn bootstrap`
+- Commit the changed files (`package.json`. `yarn.lock` and EUI `.tgz` package) and push your branch
+- Create a Kibana (draft) pull request
+
+#### Deploy the custom EUI package
+
+There are two ways you can deploy your local EUI package in Kibana.
+
+1. add the labels `ci:cloud-deploy` and `ci:cloud-persist-deployment` on your PR and ensure the CI pipelines run 
+  - after the pipelines finish the "Build" information will have a link to the cloud deployment and access information ([vault access](https://docs.elastic.dev/vault/infra-vault/accessing) is required)
+2. use [Kibana-a-la-carte](https://kibana-a-la-carte.kbndev.co/) to deploy your PR
+
+
+
 ## Testing in the cloud
 
 Elastic engineers have the option of deploying a specific branch of EUI against a specific branch of Kibana in the cloud in a development environment. For more information, see: