Support concurrency (#124)

To support `concurrency` syntax for Gitea Actions

Gitea PR: https://github.com/go-gitea/gitea/pull/32751

Reviewed-on: https://gitea.com/gitea/act/pulls/124
Reviewed-by: Lunny Xiao <lunny@noreply.gitea.com>
Co-authored-by: Zettat123 <zettat123@gmail.com>
Co-committed-by: Zettat123 <zettat123@gmail.com>

pkg/model/workflow.go

@@ -23,6 +23,8 @@ type Workflow struct {
 	Env      map[string]string `yaml:"env"`
 	Jobs     map[string]*Job   `yaml:"jobs"`
 	Defaults Defaults          `yaml:"defaults"`
+
+	RawConcurrency *RawConcurrency `yaml:"concurrency"` // For Gitea
 }
 
 // On events for the workflow
@@ -769,3 +771,10 @@ func decodeNode(node yaml.Node, out interface{}) bool {
 	}
 	return true
 }
+
+// For Gitea
+// RawConcurrency represents a workflow concurrency or a job concurrency with uninterpolated options
+type RawConcurrency struct {
+	Group            string `yaml:"group,omitempty"`
+	CancelInProgress string `yaml:"cancel-in-progress,omitempty"`
+}