Dashboards: Make path to default dashboard configurable (#25595)

Closes #25463

Co-authored-by: Arve Knudsen <arve.knudsen@gmail.com>
Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

pkg/setting/setting.go

@@ -227,6 +227,7 @@ type Cfg struct {
 	AppUrl           string
 	AppSubUrl        string
 	ServeFromSubPath bool
+	StaticRootPath   string
 
 	// build
 	BuildVersion string
@@ -272,6 +273,9 @@ type Cfg struct {
 	DisableSanitizeHtml              bool
 	EnterpriseLicensePath            string
 
+	// Dashboards
+	DefaultHomeDashboardPath string
+
 	// Auth
 	LoginCookieName              string
 	LoginMaxInactiveLifetimeDays int
@@ -699,6 +703,7 @@ func (cfg *Cfg) Load(args *CommandLineArgs) error {
 		return err
 	}
 	StaticRootPath = makeAbsolute(staticRoot, HomePath)
+	cfg.StaticRootPath = StaticRootPath
 
 	if err := cfg.validateStaticRootPath(); err != nil {
 		return err
@@ -778,6 +783,8 @@ func (cfg *Cfg) Load(args *CommandLineArgs) error {
 		return err
 	}
 
+	cfg.DefaultHomeDashboardPath = dashboards.Key("default_home_dashboard_path").MustString("")
+
 	//  read data source proxy white list
 	DataProxyWhiteList = make(map[string]bool)
 	securityStr, err := valueAsString(security, "data_source_proxy_whitelist", "")