enable yaml anchors in workflow parser (#624)

Author: ChristopherHX

.github/workflows/nuget.yml

@@ -191,6 +191,7 @@ jobs:
         Runner.Client --event azpipelines -C testworkflows/azpipelines/extend-variables -W testworkflows/azpipelines/extend-variables/pipeline.yml
         Runner.Client --event azpipelines -C testworkflows/azpipelines/runoncedeploycheckout -W testworkflows/azpipelines/runoncedeploycheckout/pipeline.yml --local-repository az/fork@main=testworkflows/azpipelines
         Runner.Client --event azpipelines -C testworkflows/azpipelines/nuget-restore-task -W testworkflows/azpipelines/nuget-restore-task/pipeline.yml
+        Runner.Client -W testworkflows/verify-yaml-anchors.yml
     - name: Windows Container Change Firewall Settings
       if: contains(matrix.os, 'windows') && !job.container
       run: |

src/Runner.Server/Controllers/MessageController.cs

@@ -750,7 +750,7 @@ private HookResponse ConvertYaml2(string fileRelativePath, string content, strin
                     var fileContent = content ?? System.IO.File.ReadAllText(fileRelativePath);
                     using (var stringReader = new StringReader(fileContent))
                     {
-                        var yamlObjectReader = new YamlObjectReader(fileId, stringReader, workflowContext.HasFeature("system.runner.server.yaml.anchors"), workflowContext.HasFeature("system.runner.server.yaml.fold"), workflowContext.HasFeature("system.runner.server.yaml.merge"));
+                        var yamlObjectReader = new YamlObjectReader(fileId, stringReader, workflowContext.HasFeature("system.runner.server.yaml.anchors", true /* https://github.com/actions/runner/issues/1182#issuecomment-3150797791 now true */), workflowContext.HasFeature("system.runner.server.yaml.fold"), workflowContext.HasFeature("system.runner.server.yaml.merge"));
                         token = TemplateReader.Read(templateContext, workflowContext.HasFeature("system.runner.server.strictValidation") ? "workflow-root-strict" : "workflow-root", yamlObjectReader, fileId, out _);
                     }
 

testworkflows/verify-yaml-anchors.yml

@@ -0,0 +1,12 @@
+on: push
+jobs:
+  job-with-condition:
+    runs-on: &label
+      self-hosted
+    if: success() || success('joba', 'jobb') || failure() || failure('joba', 'jobb') || always() || cancelled()
+    steps: &steps
+    - run: exit 0
+  then:
+    runs-on: *label
+    steps:
+    - run: exit 0