Add /about endpoint

config/config.go

@@ -8,6 +8,8 @@ import (
 
 var bearerToken string
 var port string
+var buildDate string
+var gitSHA string
 
 func Bearer() string {
 	return bearerToken
@@ -17,6 +19,14 @@ func Port() string {
 	return port
 }
 
+func BuildDate() string {
+	return buildDate
+}
+
+func GitSHA() string {
+	return gitSHA
+}
+
 func readFromEnv(key string) (string, error) {
 	val, ok := os.LookupEnv(key)
 	if !ok {