Add default values

action.yml

@@ -33,12 +33,15 @@ inputs:
   passphrase:
     description: 'The passphrase to use (optional; only required if client-side encryption enabled on the workspace)'
     required: false
+    default: ''
   merge:
     description: 'Whether to merge layout information from the remote workspace (optional: defaults to true)'
     required: false
+    default: ''
   archive:
     description: 'Whether to store the previous version of the remote workspace (optional; default to true)'
     required: false
+    default: ''
 runs:
   using: 'docker'
   image: 'docker://ghcr.io/aidmax/structurizr-cli-docker:latest'