Add "Run" prefix for unnamed action steps (#36624)

Steps defined with `run:` or `uses:` without an explicit `name:` now
display with a "Run <cmd>" prefix in the Actions log UI, matching GitHub
Actions behavior.

<img width="311" height="236" alt="image"
src="https://github.com/user-attachments/assets/9fde83f5-c43a-4732-ac55-0f4e1fbc1314"
/>

---------

Signed-off-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

models/actions/task.go

@@ -8,6 +8,7 @@ import (
 	"crypto/subtle"
 	"errors"
 	"fmt"
+	"strings"
 	"time"
 
 	auth_model "code.gitea.io/gitea/models/auth"
@@ -20,6 +21,7 @@ import (
 
 	runnerv1 "code.gitea.io/actions-proto-go/runner/v1"
 	lru "github.com/hashicorp/golang-lru/v2"
+	"github.com/nektos/act/pkg/jobparser"
 	"google.golang.org/protobuf/types/known/timestamppb"
 	"xorm.io/builder"
 )
@@ -214,6 +216,20 @@ func GetRunningTaskByToken(ctx context.Context, token string) (*ActionTask, erro
 	return nil, errNotExist
 }
 
+func makeTaskStepDisplayName(step *jobparser.Step, limit int) (name string) {
+	if step.Name != "" {
+		name = step.Name // the step has an explicit name
+	} else {
+		// for unnamed step, its "String()" method tries to get a display name by its "name", "uses",
+		// "run" or "id" (last fallback), we add the "Run " prefix for unnamed steps for better display
+		// for multi-line "run" scripts, only use the first line to match GitHub's behavior
+		// https://github.com/actions/runner/blob/66800900843747f37591b077091dd2c8cf2c1796/src/Runner.Worker/Handlers/ScriptHandler.cs#L45-L58
+		runStr, _, _ := strings.Cut(strings.TrimSpace(step.Run), "\n")
+		name = "Run " + util.IfZero(strings.TrimSpace(runStr), step.String())
+	}
+	return util.EllipsisDisplayString(name, limit) // database column has a length limit
+}
+
 func CreateTaskForRunner(ctx context.Context, runner *ActionRunner) (*ActionTask, bool, error) {
 	ctx, committer, err := db.TxContext(ctx)
 	if err != nil {
@@ -293,9 +309,8 @@ func CreateTaskForRunner(ctx context.Context, runner *ActionRunner) (*ActionTask
 	if len(workflowJob.Steps) > 0 {
 		steps := make([]*ActionTaskStep, len(workflowJob.Steps))
 		for i, v := range workflowJob.Steps {
-			name := util.EllipsisDisplayString(v.String(), 255)
 			steps[i] = &ActionTaskStep{
-				Name:   name,
+				Name:   makeTaskStepDisplayName(v, 255),
 				TaskID: task.ID,
 				Index:  int64(i),
 				RepoID: task.RepoID,