Support changing labels (#201)

Implement proposal: https://github.com/go-gitea/gitea/issues/24540

Related:
- Protocol: https://gitea.com/gitea/actions-proto-def/pulls/9
- Gitea side: https://github.com/go-gitea/gitea/pull/24806

Co-authored-by: Jason Song <i@wolfogre.com>
Reviewed-on: https://gitea.com/gitea/act_runner/pulls/201
Reviewed-by: Jason Song <i@wolfogre.com>
Co-authored-by: sillyguodong <gedong_1994@163.com>
Co-committed-by: sillyguodong <gedong_1994@163.com>

internal/pkg/config/config.example.yaml

@@ -26,6 +26,11 @@ runner:
   fetch_timeout: 5s
   # The interval for fetching the job from the Gitea instance.
   fetch_interval: 2s
+  # The labels of a runner are used to determine which jobs the runner can run, and how to run them.
+  # Like: ["macos-arm64:host", "ubuntu-latest:docker://node:16-bullseye", "ubuntu-22.04:docker://node:16-bullseye"]
+  # If it's empty when registering, it will ask for inputting labels.
+  # If it's empty when execute `deamon`, will use labels in `.runner` file.
+  labels: []
 
 cache:
   # Enable cache server to use actions/cache.

internal/pkg/config/config.go

@@ -29,6 +29,7 @@ type Runner struct {
 	Insecure      bool              `yaml:"insecure"`       // Insecure indicates whether the runner operates in an insecure mode.
 	FetchTimeout  time.Duration     `yaml:"fetch_timeout"`  // FetchTimeout specifies the timeout duration for fetching resources.
 	FetchInterval time.Duration     `yaml:"fetch_interval"` // FetchInterval specifies the interval duration for fetching resources.
+	Labels        []string          `yaml:"labels"`         // Labels specifies the labels of the runner. Labels are declared on each startup
 }
 
 // Cache represents the configuration for caching.