fix: make container.docker_host default to - (part two)

If --config is not specified, the default must also be "-" and not ""

RELEASE-NOTES.md

@@ -2,6 +2,7 @@
 
 ## 5.0.0
 
+* Breaking change: the default configuration for `docker_host` is changed to [not mounting the docker server socket](https://code.forgejo.org/forgejo/runner/pulls/305) even when no configuration file is provided.
 * [Add job_level logging option to config](https://code.forgejo.org/forgejo/runner/pulls/299) to make the logging level of jobs configurable. Change default from "trace" to "info".
 * [Don't log job output when debug logging is not enabled](https://code.forgejo.org/forgejo/runner/pulls/303). This reduces the default amount of log output of the runner.
 

internal/pkg/config/config.go

@@ -153,6 +153,10 @@ func LoadDefault(file string) (*Config, error) {
 		cfg.Runner.ReportInterval = time.Second
 	}
 
+	if cfg.Container.DockerHost == "" {
+		cfg.Container.DockerHost = "-"
+	}
+
 	// although `container.network_mode` will be deprecated, but we have to be compatible with it for now.
 	if cfg.Container.NetworkMode != "" && cfg.Container.Network == "" {
 		log.Warn("You are trying to use deprecated configuration item of `container.network_mode`, please use `container.network` instead.")

internal/pkg/config/config_test.go

@@ -40,5 +40,6 @@ func TestDefaultSettings(t *testing.T) {
 	config, err := LoadDefault("")
 	assert.NoError(t, err)
 
+	assert.EqualValues(t, config.Container.DockerHost, "-")
 	assert.EqualValues(t, config.Log.JobLevel, "info")
 }