Add support for passing variables to the GitLab pipeline

.github/workflows/test.yml

@@ -27,6 +27,8 @@ jobs:
           GL_PROJECT_ID: '1000'
           GL_RUNNER_TOKEN: some_long_runner_token
           GL_API_TOKEN: TEST1234567890123456
+        env:
+          GLPA_SOME_VARIABLE: some value for the variable
       - run: 'curl --silent --header "Private-Token: TEST1234567890123456" "http://127.17.0.1:8080/api/v4/projects/1000/jobs/1/trace"'
         if: always()
       - run: docker compose down

lib/action/step/trigger_pipeline.rb

@@ -6,11 +6,16 @@ class TriggerPipeline < Base
       def execute
         context.gl_pipeline = context.gitlab_client.create_pipeline(
           context.gl_project_id,
-          context.gl_branch_name
+          context.gl_branch_name,
+          variables
         )
 
         puts "Triggered: #{context.gl_pipeline.web_url}"
       end
+
+      def variables
+        ENV.select { |key| key.start_with?('GLPA_') }.map { |key, value| [key.delete_prefix('GLPA_'), value] }.to_h
+      end
     end
   end
 end

test/.gitlab-ci.yml

@@ -1,3 +1,4 @@
 job:
   script:
     - echo $CI_COMMIT_SHA
+    - echo $SOME_VARIABLE