Add pipeline ID and URL for downstream variables

Allows bridge jobs to expand variables that use
CI_PIPELINE_ID and CI_PIPELINE_URL

ee/app/models/ee/ci/bridge.rb

@@ -130,7 +130,9 @@ module EE
       end
 
       def downstream_variables
-        scoped_variables.to_runner_variables.yield_self do |all_variables|
+        variables = scoped_variables.concat(pipeline.persisted_variables)
+
+        variables.to_runner_variables.yield_self do |all_variables|
           yaml_variables.to_a.map do |hash|
             { key: hash[:key], value: ::ExpandVariables.expand(hash[:value], all_variables) }
           end

ee/changelogs/unreleased/13070-bad-interpolation-of-ci_pipeline_id-when-passing-variables-to-an.yml

+---
+title: Pass pipeline variables when expanding Bridge downstream variables.
+merge_request: 18875
+author:
+type: fixed

ee/spec/models/ci/bridge_spec.rb

@@ -225,13 +225,40 @@ describe Ci::Bridge do
     end
 
     context 'when using variables interpolation' do
+      let(:yaml_variables) do
+        [
+          {
+            key: 'EXPANDED',
+            value: '$BRIDGE-bridge',
+            public: true
+          },
+          {
+            key: 'UPSTREAM_CI_PIPELINE_ID',
+            value: '$CI_PIPELINE_ID',
+            public: true
+          },
+          {
+            key: 'UPSTREAM_CI_PIPELINE_URL',
+            value: '$CI_PIPELINE_URL',
+            public: true
+          }
+        ]
+      end
+
       before do
-        bridge.yaml_variables << { key: 'EXPANDED', value: '$BRIDGE-bridge', public: true }
+        bridge.yaml_variables.concat(yaml_variables)
       end
 
       it 'correctly expands variables with interpolation' do
+        expanded_values = pipeline
+          .persisted_variables
+          .to_hash
+          .transform_keys { |key| "UPSTREAM_#{key}" }
+          .map { |key, value| { key: key, value: value } }
+          .push(key: 'EXPANDED', value: 'cross-bridge')
+
         expect(bridge.downstream_variables)
-          .to include(key: 'EXPANDED', value: 'cross-bridge')
+          .to match(a_collection_including(*expanded_values))
       end
     end