Support changing labels of Actions runner without re-registration (#24806)

close #24540

related:
- Protocol: https://gitea.com/gitea/actions-proto-def/pulls/9
- Runner side: https://gitea.com/gitea/act_runner/pulls/201

changes:
- Add column of `labels` to table `action_runner`, and combine the value
of `agent_labels` and `custom_labels` column to `labels` column.
- Store `labels` when registering `act_runner`.
- Update `labels` when `act_runner` starting and calling `Declare`.
- Users cannot modify the `custom labels` in edit page any more.

other changes:
- Store `version` when registering `act_runner`.
- If runner is latest version, parse version from `Declare`. But older
version runner still parse version from request header.

models/actions/runner.go

@@ -43,10 +43,8 @@ type ActionRunner struct {
 	LastOnline timeutil.TimeStamp `xorm:"index"`
 	LastActive timeutil.TimeStamp `xorm:"index"`
 
-	// Store OS and Artch.
-	AgentLabels []string
-	// Store custom labes use defined.
-	CustomLabels []string
+	// Store labels defined in state file (default: .runner file) of `act_runner`
+	AgentLabels []string `xorm:"TEXT"`
 
 	Created timeutil.TimeStamp `xorm:"created"`
 	Updated timeutil.TimeStamp `xorm:"updated"`
@@ -104,11 +102,6 @@ func (r *ActionRunner) IsOnline() bool {
 	return false
 }
 
-// AllLabels returns agent and custom labels
-func (r *ActionRunner) AllLabels() []string {
-	return append(r.AgentLabels, r.CustomLabels...)
-}
-
 // Editable checks if the runner is editable by the user
 func (r *ActionRunner) Editable(ownerID, repoID int64) bool {
 	if ownerID == 0 && repoID == 0 {