Support Simplified Concurrency (#139)

- update RawConcurrency struct to parse and serialize string-based concurrency notation
- update EvaluateConcurrency to handle new RawConcurrency format

Reviewed-on: https://gitea.com/gitea/act/pulls/139
Reviewed-by: Zettat123 <zettat123@noreply.gitea.com>
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: ChristopherHX <christopher.homberger@web.de>
Co-committed-by: ChristopherHX <christopher.homberger@web.de>

pkg/jobparser/model.go

@@ -276,9 +276,21 @@ func EvaluateConcurrency(rc *model.RawConcurrency, jobID string, job *Job, gitCt
 	}
 
 	evaluator := NewExpressionEvaluator(NewInterpeter(jobID, actJob, matrix, toGitContext(gitCtx), results, vars, inputs))
-	group := evaluator.Interpolate(rc.Group)
+	var node yaml.Node
-	cancelInProgress := evaluator.Interpolate(rc.CancelInProgress)
+	if err := node.Encode(rc); err != nil {
-	return group, cancelInProgress == "true", nil
+		return "", false, fmt.Errorf("failed to encode concurrency: %w", err)
+	}
+	if err := evaluator.EvaluateYamlNode(&node); err != nil {
+		return "", false, fmt.Errorf("failed to evaluate concurrency: %w", err)
+	}
+	var evaluated model.RawConcurrency
+	if err := node.Decode(&evaluated); err != nil {
+		return "", false, fmt.Errorf("failed to unmarshal evaluated concurrency: %w", err)
+	}
+	if evaluated.RawExpression != "" {
+		return evaluated.RawExpression, false, nil
+	}
+	return evaluated.Group, evaluated.CancelInProgress == "true", nil
 }
 
 func toGitContext(input map[string]any) *model.GithubContext {

pkg/model/workflow.go

@@ -778,4 +778,22 @@ func decodeNode(node yaml.Node, out interface{}) bool {
 type RawConcurrency struct {
 	Group            string `yaml:"group,omitempty"`
 	CancelInProgress string `yaml:"cancel-in-progress,omitempty"`
+	RawExpression    string `yaml:"-,omitempty"`
+}
+
+type objectConcurrency RawConcurrency
+
+func (r *RawConcurrency) UnmarshalYAML(n *yaml.Node) error {
+	if err := n.Decode(&r.RawExpression); err == nil {
+		return nil
+	}
+	return n.Decode((*objectConcurrency)(r))
+}
+
+func (r *RawConcurrency) MarshalYAML() (interface{}, error) {
+	if r.RawExpression != "" {
+		return r.RawExpression, nil
+	}
+
+	return (*objectConcurrency)(r), nil
 }