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>

.github/workflows/test.yml

@@ -64,7 +64,7 @@ jobs:
             PermitRootLogin no
             Subsystem sftp /usr/lib/openssh/sftp-server
           EOF
-          sudo systemctl restart sshd
+          sudo systemctl restart ssh
           echo 'SSH_KNOWN_HOSTS<<EOF' >> $GITHUB_ENV
           echo $(ssh-keyscan localhost) >> $GITHUB_ENV
           echo 'EOF' >> $GITHUB_ENV
@@ -97,6 +97,13 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
+      - name: With check mode
+        uses: ./
+        with:
+          playbook: playbook.yml
+          directory: test
+          check_mode: true
+          options: --inventory hosts
       - name: With custom ansible.cfg
         uses: ./
         with: