add output-env-credentials flag (defaults to true)

action.yml

@@ -61,6 +61,10 @@ inputs:
   output-credentials:
     description: Whether to set credentials as step output
     required: false
+  output-env-credentials:
+    description: Whether to export credentials as environment variables. If you set this to false, you probably want to use output-credentials.
+    required: false
+    default: true
   unset-current-credentials:
     description: Whether to unset the existing credentials in your runner. May be useful if you run this action multiple times in the same job
     required: false
@@ -84,3 +88,5 @@ outputs:
     description: The AWS secret access key for the provided credentials
   aws-session-token:
     description: The AWS session token for the provided credentials
+  aws-expiration:
+    description: The expiration time for the provided credentials