feat: Take dependencies into account when sorting environment variables (#1249)

* feat: Take dependencies into account when sorting environment variables

* feat: Use sorting algorithm for IntoIterator for EnvVarSet

* chore: Upgrade spin

* chore: Use LazyLock for regexes

* chore: Use sort_by_cached_key

* fix: escaped dollar signs

* chore: Use local error type

* chore: Re-add sort_by_cached_key

* chore: Improve comment wording

* chore: Adapt wording

* chore: Use references when sorting environment variables

* Apply suggestions from code review

Co-authored-by: Techassi <git@techassi.dev>

* Fix cyclic call in IntoIterator for EnvVarSet

---------

Co-authored-by: Techassi <git@techassi.dev>

Author: siegfriedweber

Cargo.lock

@@ -4,6 +4,17 @@ All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
 
+### Added
+
+- [v2] Add `EnvVarSet::with_env_var` to add a given `EnvVar` to the set ([#1249]).
+
+### Changed
+
+- [v2] BREAKING: Converting an `EnvVarSet` into a `Vec<EnvVar>` takes dependencies between
+  environment variables into account ([#1249]).
+
+[#1249]: https://github.com/stackabletech/operator-rs/pull/1249
+
 ## [0.113.4] - 2026-07-09
 
 ### Changed