Linux demo updates bblasco podman (#47)

* Switched from using podman volumes to file path (issue #36)

* Improved readability of output

* Added a sensible default message for web server (Issue #36)

Co-authored-by: Benjamin Blasco <bblasco@redhat.com>

linux/setup.yml

@@ -267,6 +267,7 @@ controller_templates:
           type: textarea
           variable: message
           required: true
+          default: "This is Apache webserver running in a container with podman"
 
   - name: "LINUX / System Roles"
     job_type: run