Change name of permissions monitoring config input

Also:
- Update the description of this input.
- Give the input the same default value that the
GitHubSecurityLab/actions-permission/monitor action uses.
- Make the input not required.

README.md

@@ -12,8 +12,8 @@ beginning of every GitHub Actions job.
 
 | Name | Description | Interpreted Type | Default | Required |
 |------|-------------|------------------|---------|:--------:|
-| actions_permissions_config | A JSON string containing the permissions configuration to use for permissions monitoring.  In the case of cisagov you will usually want to set this to `${{ vars.ACTIONS_PERMISSIONS_CONFIG }}` so it agrees with our organization-wide GitHub Actions permissions configuration.  See [the documentation for the GitHubSecurityLab/actions-permissions/monitor action](https://github.com/GitHubSecurityLab/actions-permissions/tree/main/monitor#configuration) for more details. | `string` | n/a | yes |
 | harden_runner_egress_policy | The egress policy to use for runner hardening.  See [step-security/harden-runner](https://github.com/step-security/harden-runner) for more details and valid values. | `string` | `audit` | no |
+| permissions_monitoring_config | A JSON string containing the configuration to use for permissions monitoring.  In the case of cisagov you will usually want to set this to `${{ vars.ACTIONS_PERMISSIONS_CONFIG }}` so it agrees with our organization-wide GitHub Actions permissions monitoring configuration.  See [the documentation for the GitHubSecurityLab/actions-permissions/monitor action](https://github.com/GitHubSecurityLab/actions-permissions/tree/main/monitor#configuration) for more details. | `string` | `""` | no |
 
 ### Outputs ###
 

action.yml

@@ -9,24 +9,24 @@ description: >-
 name: Job preamble
 
 inputs:
-  actions_permissions_config:
-    description: >-
-      A JSON string containing the permissions configuration to use
-      for permissions monitoring.  In the case of cisagov you will
-      usually want to set this to `\$\{\{
-      vars.ACTIONS_PERMISSIONS_CONFIG \}\}` so it agrees with our
-      organization-wide GitHub Actions permissions configuration.  See
-      the documentation for the
-      GitHubSecurityLab/actions-permission/monitor action for more
-      details:
-      https://github.com/GitHubSecurityLab/actions-permissions/tree/main/monitor#configuration
-    required: true
   harden_runner_egress_policy:
     default: audit
     description: >-
       The egress policy to use for runner hardening.  See
       step-security/harden-runner for more details and valid values.
     required: false
+  permissions_monitoring_config:
+    default: ""
+    description: >-
+      A JSON string containing the configuration to use for
+      permissions monitoring.  In the case of cisagov you will almost
+      usually to set this to `\$\{\{ vars.ACTIONS_PERMISSIONS_CONFIG
+      \}\}` so it agrees with our organization-wide GitHub Actions
+      permissions monitoring configuration.  See the documentation for
+      the GitHubSecurityLab/actions-permission/monitor action for more
+      details:
+      https://github.com/GitHubSecurityLab/actions-permissions/tree/main/monitor#configuration
+    required: false
 
 runs:
   using: composite