Make variables collection to runner mapping explicit

app/models/project_services/kubernetes_service.rb

@@ -115,7 +115,7 @@ class KubernetesService < DeploymentService
       collection.append(key: 'KUBE_CA_PEM_FILE', value: ca_pem, public: true, file: true)
     end
 
-    variables.to_hash
+    variables.to_runner_variables
   end
 
   # Constructs a list of terminals from the reactive cache

lib/gitlab/ci/variables/collection.rb

@@ -27,7 +27,7 @@ module Gitlab
           end
         end
 
-        def to_h
+        def to_runner_variables
           self.map do |variable|
             variable.to_h.reject do |key, value|
               key == :file && value == false
@@ -35,8 +35,6 @@ module Gitlab
           end
         end
 
-        alias_method :to_hash, :to_h
-
         private
 
         def fabricate(resource)

spec/lib/gitlab/ci/variables/collection_spec.rb

@@ -52,11 +52,11 @@ describe Gitlab::Ci::Variables::Collection do
     end
   end
 
-  describe '#to_hash' do
-    it 'creates a hash / value mapping' do
+  describe '#to_runner_variables' do
+    it 'creates an array of hashes in a runner-compatible format' do
       collection = described_class.new([{ key: 'TEST', value: 1 }])
 
-      expect(collection.to_hash)
+      expect(collection.to_runner_variables)
         .to eq [{ key: 'TEST', value: 1, public: false }]
     end
   end