Merge branch 'enforce-variable-value-to-be-a-string' into 'master'

Enforce setting string as value of the CI/CD variable

Closes #48210

See merge request gitlab-org/gitlab-ce!20061

1 files changed, 3 insertions, 0 deletions

diff --git a/lib/gitlab/ci/variables/collection/item.rb b/lib/gitlab/ci/variables/collection/item.rb
index d00e5b07f95..222aa06b800 100644
--- a/lib/gitlab/ci/variables/collection/item.rb
+++ b/lib/gitlab/ci/variables/collection/item.rb
@@ -4,6 +4,9 @@ module Gitlab
       class Collection
         class Item
           def initialize(key:, value:, public: true, file: false)
+            raise ArgumentError, "`value` must be of type String, while it was: #{value.class}" unless
+              value.is_a?(String) || value.nil?
+
             @variable = {
               key: key, value: value, public: public, file: file
             }