Add check mode and fixes boolean inputs (#111)

* Add check mode option

* Fixes boolean inputs

Boolean inputs weren't working properly before. Passing any value would
result in `true`, which is unexpected and not according to inputs
description. This change retrieves booleans with `getBooleanInput()` and
sets a default to `false`.

Relevant GitHub discussion and comment: https://github.com/actions/toolkit/issues/361#issuecomment-829507270

* Update action.yml

* Update test.yml

* Update test.yml

---------

Co-authored-by: Dawid Dziurla <dawidd0811@gmail.com>

action.yml

@@ -34,9 +34,15 @@ inputs:
   sudo:
     description: Set to "true" if root is required for running your playbook
     required: false
+    default: false
   no_color:
     description: Set to "true" if the Ansible output should not include colors (defaults to "false")
     required: false
+    default: false
+  check_mode:
+    description: Set to "true" to enable check (dry-run) mode
+    required: false
+    default: false
 outputs:
   output:
     description: The captured output of both stdout and stderr from the Ansible Playbook run