feat(core): Support environment variable parsing in config files (#1640)

easytier-contrib/easytier-ohrs/Cargo.lock

@@ -1071,6 +1071,7 @@ dependencies = [
  "serde_json",
  "service-manager",
  "sha2",
+ "shellexpand",
  "smoltcp",
  "socket2 0.5.10",
  "stun_codec",
@@ -3925,6 +3926,15 @@ dependencies = [
  "lazy_static",
 ]
 
+[[package]]
+name = "shellexpand"
+version = "3.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b1fdf65dd6331831494dd616b30351c38e96e45921a27745cf98490458b90bb"
+dependencies = [
+ "dirs",
+]
+
 [[package]]
 name = "shlex"
 version = "1.3.0"