fix: move variable to global pipeline definition

Signed-off-by: Bart Jaskulski <bjaskulski@protonmail.com>

gitlab-ci-1.2.yml

@@ -12,6 +12,9 @@ variables:
   CONTRIBUTORS: "wpdesk,dyszczo,grola,piotrpo,marcinkolanko"
   MINIMAL_WP_TESTED_UP: "6.2"
   MINIMAL_WC_TESTED_UP: "8.1"
+  DEMO_DEPLOY_TARGETS:
+    value: "demo.wpdesk.org,demo.wpdesk.pl"
+    description: "Override this variable in project's .gitlab-ci.yml to support other servers. List supported targets separated by `,`. You may also use short name for deploy target, like \"wpdesk,octolize\" to support both wpdesk and both octolize targets. Currently supported targets: demo.wpdesk.org, demo.wpdesk.pl, demo.octolize.com, stage.demo.octolize.com, demo.flexibleinvoices."
 
 stages:
   - prepare-vendor

includes/deploy/demo.yml

 deploy:demo:
   image: gitlab.wpdesk.dev:5050/wpdesk/docker-tests/amazon-svn-deploy:24.09
-  variables:
-    DEMO_DEPLOY_TARGETS:
-      value: "demo.wpdesk.org,demo.wpdesk.pl"
-      description: "Override this variable in project's .gitlab-ci.yml to support other servers. List supported targets separated by `,`. You may also use short name for deploy target, like \"wpdesk,octolize\" to support both wpdesk and both octolize targets. Currently supported targets: demo.wpdesk.org, demo.wpdesk.pl, demo.octolize.com, stage.demo.octolize.com, demo.flexibleinvoices."
   environment:
     name: $DEPLOY_SERVER
     url: https://$DEPLOY_SERVER