FeatureFlags: define features outside settings.Cfg (take 3) (#44443)

pkg/services/featuremgmt/settings.go

@@ -0,0 +1,34 @@
+package featuremgmt
+
+import (
+	"io/ioutil"
+
+	"gopkg.in/yaml.v2"
+)
+
+type configBody struct {
+	// define variables that can be used in expressions
+	Vars map[string]interface{} `yaml:"vars"`
+
+	// Define and override feature flag properties
+	Flags []FeatureFlag `yaml:"flags"`
+
+	// keep track of where the fie was loaded from
+	filename string
+}
+
+// will read a single configfile
+func readConfigFile(filename string) (*configBody, error) {
+	cfg := &configBody{}
+
+	// Can ignore gosec G304 because the file path is forced within config subfolder
+	//nolint:gosec
+	yamlFile, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return cfg, err
+	}
+
+	err = yaml.Unmarshal(yamlFile, cfg)
+	cfg.filename = filename
+	return cfg, err
+}