Add CapabilitiesJson to FetchTaskRequest

Allows runners to send capabilities including disk space with each FetchTask poll.

runner/v1/messages.pb.go

@@ -392,7 +392,8 @@ type FetchTaskRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	TasksVersion int64 `protobuf:"varint,1,opt,name=tasks_version,json=tasksVersion,proto3" json:"tasks_version,omitempty"` // Runner use `tasks_version` to compare with Gitea and detemine whether new tasks may exist.
+	TasksVersion     int64  `protobuf:"varint,1,opt,name=tasks_version,json=tasksVersion,proto3" json:"tasks_version,omitempty"`     // Runner use `tasks_version` to compare with Gitea and detemine whether new tasks may exist.
+	CapabilitiesJson string `protobuf:"bytes,2,opt,name=capabilities_json,json=capabilitiesJson,proto3" json:"capabilities_json,omitempty"` // JSON-encoded runner capabilities including disk space
 }
 
 func (x *FetchTaskRequest) Reset() {
@@ -434,6 +435,13 @@ func (x *FetchTaskRequest) GetTasksVersion() int64 {
 	return 0
 }
 
+func (x *FetchTaskRequest) GetCapabilitiesJson() string {
+	if x != nil {
+		return x.CapabilitiesJson
+	}
+	return ""
+}
+
 type FetchTaskResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache