Show Actions post step when it's running (go-gitea#29926)

The post step was always waiting, even if all steps were done. Then,
once the task was done, the post step became success immediately.

Before:

<img width="915" alt="xnip_240320_120228"
src="https://github.com/go-gitea/gitea/assets/9418365/00347430-f998-4c43-917a-bf6dd6d0e333">

After:

<img width="905" alt="xnip_240320_120443"
src="https://github.com/go-gitea/gitea/assets/9418365/a419b111-17c2-4029-a022-c761cc419091">

modules/actions/task_state.go

@@ -41,6 +41,12 @@ func FullSteps(task *actions_model.ActionTask) []*actions_model.ActionTaskStep {
 	}
 	logIndex += preStep.LogLength
 
+	// lastHasRunStep is the last step that has run.
+	// For example,
+	// 1. preStep(Success) -> step1(Success) -> step2(Running) -> step3(Waiting) -> postStep(Waiting): lastHasRunStep is step1.
+	// 2. preStep(Success) -> step1(Success) -> step2(Success) -> step3(Success) -> postStep(Success): lastHasRunStep is step3.
+	// 3. preStep(Success) -> step1(Success) -> step2(Failure) -> step3 -> postStep(Waiting): lastHasRunStep is step2.
+	// So its Stopped is the Started of postStep when there are no more steps to run.
 	var lastHasRunStep *actions_model.ActionTaskStep
 	for _, step := range task.Steps {
 		if step.Status.HasRun() {
@@ -56,11 +62,15 @@ func FullSteps(task *actions_model.ActionTask) []*actions_model.ActionTaskStep {
 		Name:   postStepName,
 		Status: actions_model.StatusWaiting,
 	}
-	if task.Status.IsDone() {
+	// If the lastHasRunStep is the last step, or it has failed, postStep has started.
+	if lastHasRunStep.Status.IsFailure() || lastHasRunStep == task.Steps[len(task.Steps)-1] {
 		postStep.LogIndex = logIndex
 		postStep.LogLength = task.LogLength - postStep.LogIndex
-		postStep.Status = task.Status
 		postStep.Started = lastHasRunStep.Stopped
+		postStep.Status = actions_model.StatusRunning
+	}
+	if task.Status.IsDone() {
+		postStep.Status = task.Status
 		postStep.Stopped = task.Stopped
 	}
 	ret := make([]*actions_model.ActionTaskStep, 0, len(task.Steps)+2)

modules/actions/task_state_test.go

@@ -103,6 +103,40 @@ func TestFullSteps(t *testing.T) {
 				{Name: postStepName, Status: actions_model.StatusSuccess, LogIndex: 100, LogLength: 0, Started: 10100, Stopped: 10100},
 			},
 		},
+		{
+			name: "all steps finished but task is running",
+			task: &actions_model.ActionTask{
+				Steps: []*actions_model.ActionTaskStep{
+					{Status: actions_model.StatusSuccess, LogIndex: 10, LogLength: 80, Started: 10010, Stopped: 10090},
+				},
+				Status:    actions_model.StatusRunning,
+				Started:   10000,
+				Stopped:   0,
+				LogLength: 100,
+			},
+			want: []*actions_model.ActionTaskStep{
+				{Name: preStepName, Status: actions_model.StatusSuccess, LogIndex: 0, LogLength: 10, Started: 10000, Stopped: 10010},
+				{Status: actions_model.StatusSuccess, LogIndex: 10, LogLength: 80, Started: 10010, Stopped: 10090},
+				{Name: postStepName, Status: actions_model.StatusRunning, LogIndex: 90, LogLength: 10, Started: 10090, Stopped: 0},
+			},
+		},
+		{
+			name: "skipped task",
+			task: &actions_model.ActionTask{
+				Steps: []*actions_model.ActionTaskStep{
+					{Status: actions_model.StatusSkipped, LogIndex: 0, LogLength: 0, Started: 0, Stopped: 0},
+				},
+				Status:    actions_model.StatusSkipped,
+				Started:   0,
+				Stopped:   0,
+				LogLength: 0,
+			},
+			want: []*actions_model.ActionTaskStep{
+				{Name: preStepName, Status: actions_model.StatusSkipped, LogIndex: 0, LogLength: 0, Started: 0, Stopped: 0},
+				{Status: actions_model.StatusSkipped, LogIndex: 0, LogLength: 0, Started: 0, Stopped: 0},
+				{Name: postStepName, Status: actions_model.StatusSkipped, LogIndex: 0, LogLength: 0, Started: 0, Stopped: 0},
+			},
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {