fix: Use linux-latest instead of ubuntu-latest

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: linux-latest
     steps:
       - uses: actions/checkout@v4
 

.gitea/workflows/release.yml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   release:
-    runs-on: ubuntu-latest
+    runs-on: linux-latest
     steps:
       - uses: actions/checkout@v4
 

runner/v1/messages.pb.go

@@ -448,6 +448,7 @@ type FetchTaskResponse struct {
 	unknownFields protoimpl.UnknownFields
 
 	RequestBandwidthTest bool  `protobuf:"varint,3,opt,name=request_bandwidth_test,json=requestBandwidthTest,proto3" json:"request_bandwidth_test,omitempty"` // Request runner to perform bandwidth test
+	RequestCleanup       bool  `protobuf:"varint,4,opt,name=request_cleanup,json=requestCleanup,proto3" json:"request_cleanup,omitempty"`       // Request runner to perform disk cleanup
 	Task                 *Task `protobuf:"bytes,1,opt,name=task,proto3" json:"task,omitempty"`
 	TasksVersion         int64 `protobuf:"varint,2,opt,name=tasks_version,json=tasksVersion,proto3" json:"tasks_version,omitempty"` // Gitea informs the Runner of the latest version of tasks through `tasks_version`.
 }
@@ -491,6 +492,13 @@ func (x *FetchTaskResponse) GetRequestBandwidthTest() bool {
 	return false
 }
 
+func (x *FetchTaskResponse) GetRequestCleanup() bool {
+	if x != nil {
+		return x.RequestCleanup
+	}
+	return false
+}
+
 func (x *FetchTaskResponse) GetTask() *Task {
 	if x != nil {
 		return x.Task