Add option to configure workspace on host (#238)

Adds a new section to the configuration which is used
to control options when running in host mode.

The first option added is to allow configuration
of the location workspaces get created in.

Depends on ~~gitea/act#65~~
Will resolve #235

Reviewed-on: https://gitea.com/gitea/act_runner/pulls/238
Reviewed-by: Jason Song <i@wolfogre.com>
Co-authored-by: Marius Zwicker <marius.zwicker@mlba-team.de>
Co-committed-by: Marius Zwicker <marius.zwicker@mlba-team.de>

internal/app/run/runner.go

@@ -177,6 +177,7 @@ func (r *Runner) run(ctx context.Context, task *runnerv1.Task, reporter *report.
 		// On Windows, Workdir will be like "\<parent_directory>\<owner>\<repo>"
 		Workdir:        filepath.FromSlash(fmt.Sprintf("/%s/%s", r.cfg.Container.WorkdirParent, preset.Repository)),
 		BindWorkdir:    false,
+		ActionCacheDir: filepath.FromSlash(r.cfg.Host.WorkdirParent),
 
 		ReuseContainers:      false,
 		ForcePull:            false,

internal/pkg/config/config.example.yaml

@@ -72,3 +72,8 @@ container:
   # default value is the value of DOCKER_HOST environment variable.
   # if DOCKER_HOST is not set, the default value is unix:///var/run/docker.sock
   docker_host: ""
+
+host:
+  # The parent directory of a job's working directory.
+  # If it's empty, $HOME/.cache/act/ will be used.
+  workdir_parent:

internal/pkg/config/config.go

@@ -51,12 +51,18 @@ type Container struct {
 	DockerHost    string   `yaml:"docker_host"`    // DockerHost specifies the Docker host. It overrides the value specified in environment variable DOCKER_HOST.
 }
 
+// Host represents the configuration for the host.
+type Host struct {
+	WorkdirParent string `yaml:"workdir_parent"` // WorkdirParent specifies the parent directory for the host's working directory.
+}
+
 // Config represents the overall configuration.
 type Config struct {
 	Log       Log       `yaml:"log"`       // Log represents the configuration for logging.
 	Runner    Runner    `yaml:"runner"`    // Runner represents the configuration for the runner.
 	Cache     Cache     `yaml:"cache"`     // Cache represents the configuration for caching.
 	Container Container `yaml:"container"` // Container represents the configuration for the container.
+	Host      Host      `yaml:"host"`      // Host represents the configuration for the host.
 }
 
 // LoadDefault returns the default configuration.
@@ -111,6 +117,10 @@ func LoadDefault(file string) (*Config, error) {
 	if cfg.Container.WorkdirParent == "" {
 		cfg.Container.WorkdirParent = "workspace"
 	}
+	if cfg.Host.WorkdirParent == "" {
+		home, _ := os.UserHomeDir()
+		cfg.Container.WorkdirParent = filepath.Join(home, ".cache", "act")
+	}
 	if cfg.Runner.FetchTimeout <= 0 {
 		cfg.Runner.FetchTimeout = 5 * time.Second
 	}