Convert `:release` yaml to `release-cli` commands

Part of https://gitlab.com/gitlab-org/gitlab/-/issues/199250

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/34261

changelogs/unreleased/199250-expose-release-yaml-as-steps-via-api-2.yml

+---
+title: Convert `:release` yaml to `release-cli` commands
+merge_request: 34261
+author:
+type: added

lib/gitlab/ci/build/releaser.rb

+# frozen_string_literal: true
+
+module Gitlab
+  module Ci
+    module Build
+      class Releaser
+        BASE_COMMAND = 'release-cli create'
+
+        attr_reader :config
+
+        def initialize(config:)
+          @config = config
+        end
+
+        def script
+          command = BASE_COMMAND.dup
+          config.each { |k, v| command.concat(" --#{k.to_s.dasherize} \"#{v}\"") }
+
+          command
+        end
+      end
+    end
+  end
+end

spec/lib/gitlab/ci/build/releaser_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Gitlab::Ci::Build::Releaser do
+  subject { described_class.new(config: config[:release]).script }
+
+  describe '#script' do
+    context 'all nodes' do
+      let(:config) do
+        {
+          release: {
+            name: 'Release $CI_COMMIT_SHA',
+            description: 'Created using the release-cli $EXTRA_DESCRIPTION',
+            tag_name: 'release-$CI_COMMIT_SHA',
+            ref: '$CI_COMMIT_SHA'
+          }
+        }
+      end
+
+      it 'generates the script' do
+        expect(subject).to eq('release-cli create --name "Release $CI_COMMIT_SHA" --description "Created using the release-cli $EXTRA_DESCRIPTION" --tag-name "release-$CI_COMMIT_SHA" --ref "$CI_COMMIT_SHA"')
+      end
+    end
+
+    context 'individual nodes' do
+      using RSpec::Parameterized::TableSyntax
+
+      where(:node_name, :node_value, :result) do
+        'name' | 'Release $CI_COMMIT_SHA' | 'release-cli create --name "Release $CI_COMMIT_SHA"'
+        'description' | 'Release-cli $EXTRA_DESCRIPTION' | 'release-cli create --description "Release-cli $EXTRA_DESCRIPTION"'
+        'tag_name' | 'release-$CI_COMMIT_SHA' | 'release-cli create --tag-name "release-$CI_COMMIT_SHA"'
+        'ref' | '$CI_COMMIT_SHA' | 'release-cli create --ref "$CI_COMMIT_SHA"'
+      end
+
+      with_them do
+        let(:config) do
+          {
+            release: {
+              node_name => node_value
+            }
+          }
+        end
+
+        it 'generates the script' do
+          expect(subject).to eq(result)
+        end
+      end
+    end
+  end
+end