Update env variables table

Signed-off-by: Riddhesh Sanghvi <[email protected]>

Author: mrrobot47

README.md

@@ -51,12 +51,21 @@ jobs:
 This GitHub action's behavior can be customized using following environment variables:
 
 Variable          | Default | Possible  Values                                                    | Purpose
-------------------|---------|---------------------------------------------------------------------|----------------------------------------------------
+------------------|---------|---------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 `MU_PLUGINS_URL`  | null    | vip, any git repo url                                               | If value is `vip`, then action will clone [VIP's MU plugins](https://github.com/Automattic/vip-mu-plugins-public) as `mu-plugins` folder. If you want to specifiy a non-VIP mu-plugins repo, you can provide a publicly accessible mu-plugins repo URL as the value.
 `WP_VERSION`      | latest  | Any valid WordPress version                                         | If you specify a WordPress version, then that speicifc WordPress version will be downloaded, instead of latest WordPress version. WP_VERSION defined in hosts.yml will have higher priority than one defined in workflow file.
 `WP_MINOR_UPDATE` | null    | `true` / `false`                                                    | If set to `true`, latest minor version of `WP_VERSION` will be taken.
 `JUMPHOST_SERVER` | null    | Hostname/IP address of the jumphost server                          | If the deployment server is not directly accessible, and needs a jumphost, then this method should be used. (Note: The `SSH_PRIVATE_KEY` env variable should have access to the jumphost as well as deployment server for this to work. Also, this method does not work with vault.)
-`SUBMODULE_DEPLOY_KEY` | null | Read access deploy key created in the submodule repo's deploy keys. | Only required for privated submodule repo. For now only one private submodule deploy key is allowed. All public submodules in repo will be fetched by default without the need of this env variable. (To create a deploy key go to: Settings > Deploy Keys > Add deploy key)
+`SUBMODULE_DEPLOY_KEY` | null    | Read access deploy key created in the submodule repo's deploy keys. | Only required for privated submodule repo. For now only one private submodule deploy key is allowed. All public submodules in repo will be fetched by default without the need of this env variable. (To create a deploy key go to: Settings > Deploy Keys > Add deploy key)
+`SKIP_WP_TASKS` | null    | `true`/`false`                                                      | If set to `true`, WordPress specific deplyment tasks will skipped.
+`PHP_VERSION` | 7.4      | Valid PHP version                                                   | Determines the cachetool version compatible to use for purging opcache.
+`NPM_VERSION`  | null    | Valid NPM Version                                                   | NPM Version. If not specified, latest version will be used.
+`NODE_VERSION`  | null    | Valid Node Version                                                  | If not specified, default version built into action will be used.
+`NODE_BUILD_DIRECTORY`  | null    | path to valid directory on repository.                              | Build directory. Generally root directory or directory like frontend.
+`NODE_BUILD_COMMAND`  | null    | `npm run build` or similar command.                                 | Command used to to build the dependencies needed on deployment.
+`NODE_BUILD_SCRIPT`  | null    | path to valid shell script                                          | Custom or predefined script to run after compilation.
+
+All node related variables are completely optional. You can use them if your site needs to have node dependencies built.
 
 ## Server Setup