Add: Actions Offline Mode(depend on act offline_mode)

act pull #2128: https://github.com/nektos/act/pull/2128

internal/pkg/config/config.example.yaml

@@ -52,6 +52,7 @@ cache:
   # If it's specified, act_runner will use this URL as the ACTIONS_CACHE_URL rather than start a server by itself.
   # The URL should generally end with "/".
   external_server: ""
+  offline_mode: false
 
 container:
   # Specifies the network to which the container will connect.

internal/pkg/config/config.go

@@ -39,6 +39,7 @@ type Cache struct {
 	Host           string `yaml:"host"`            // Host specifies the caching host.
 	Port           uint16 `yaml:"port"`            // Port specifies the caching port.
 	ExternalServer string `yaml:"external_server"` // ExternalServer specifies the URL of external cache server
+	OfflineMode    bool   `yaml:"offline_mode"`
 }
 
 // Container represents the configuration for the container.