Quote everything inside stdout/contents except regexp (#51956)

Signed-off-by: Carlos Rodríguez Hernández <carlosrh@vmware.com>

.vib/prestashop/goss/prestashop.yaml

@@ -6,7 +6,7 @@ command:
     exec: grep -Eo "'_PS_INSTALL_VERSION_', '[^']*'" /opt/bitnami/prestashop/install/install_version.php
     exit-status: 0
     stdout:
-      - {{ .Env.APP_VERSION }}
+      - "{{ .Env.APP_VERSION }}"
   check-enabled-modules:
     exec: php -m
     exit-status: 0
@@ -19,14 +19,14 @@ file:
     exists: true
     filetype: file
     contents:
-      - post_max_size = 128M
-      - upload_max_filesize = 128M
+      - "post_max_size = 128M"
+      - "upload_max_filesize = 128M"
   # Ensure that .htaccess file contents have not been moved to /opt/bitnami/apache/conf/vhosts/htaccess
   /opt/bitnami/prestashop/app/.htaccess:
     exists: true
     filetype: file
     contents:
-      - Require all denied
+      - "Require all denied"
   # HTTP vhost should have been properly rendered
   /opt/bitnami/apache/conf/vhosts/prestashop-vhost.conf:
     exists: true