docs: set GITHUB_TOKEN to avoid rate limits

README.md

@@ -29,6 +29,7 @@ jobs:
           stack-name: org-name/stack-name
         env:
           PULUMI_ACCESS_TOKEN: ${{ secrets.PULUMI_ACCESS_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} # Avoid GitHub rate limits (see below)
 ```
 
 This will check out the existing directory and run `pulumi preview`.
@@ -41,8 +42,8 @@ The action can be configured with the following arguments:
   values are `up` (update), `refresh`, `destroy` and `preview`.
 
 - `stack-name` (required) - The name of the stack that Pulumi will be operating
-  on. Use the fully quaified org-name/stack-name when operating on a stack outside
-  of your individual account.
+  on. Use the fully quaified org-name/stack-name when operating on a stack
+  outside of your individual account.
 
 - `work-dir` (optional) - The location of your Pulumi files. Defaults to `./`.
 
@@ -105,8 +106,8 @@ The action can be configured with the following arguments:
   `Pulumi.<stack-name>.yaml` file that you will need to add back to source
   control as part of the action if you wish to perform any further tasks with
   that stack.
-- `remove` - (optional) Removes the target stack if all resources are
-  destroyed. Used only with `destroy` command.
+- `remove` - (optional) Removes the target stack if all resources are destroyed.
+  Used only with `destroy` command.
 - `pulumi-version` - (optional) Install a specific version of the Pulumi CLI.
   Defaults to "^3"
 
@@ -115,6 +116,10 @@ By default, this action will try to authenticate Pulumi with the
 `PULUMI_ACCESS_TOKEN` then you will need to specify an alternative backend via
 the `cloud-url` argument.
 
+If you are using any Pulumi plugins then you should also set the `GITHUB_TOKEN`
+environment variable in order to avoid hitting GitHub rate limits. You can set
+it to the default `${{ secrets.GITHUB_TOKEN }}`.
+
 ### Stack Outputs
 
 [Stack outputs](https://www.pulumi.com/docs/intro/concepts/stack/#outputs) are