feat: Add constants for configOverrides file header and footer keys (#843)

* Introduce pub consts for file_header and file_footerw

* Rename conts

* Moving vars to more appropriate place

* Better Var names

* Changelog

* changelog

---------

Co-authored-by: Sebastian Bernauer <[email protected]>

Author: Maleware

crates/stackable-operator/CHANGELOG.md

@@ -4,13 +4,17 @@ All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
 
-- BREAKING: Replace `lazy_static` with `std::cell::LazyCell` (the original implementation was done in [#827] and reverted in [#835]) ([#840]).
-
 ### Added
 
 - `iter::reverse_if` helper ([#838]).
+- Add two new constants `CONFIG_OVERRIDE_FILE_HEADER_KEY` and `CONFIG_OVERRIDE_FILE_FOOTER_KEY` ([#843]).
+
+### Changed
+
+- BREAKING: Replace `lazy_static` with `std::cell::LazyCell` (the original implementation was done in [#827] and reverted in [#835]) ([#840]).
 
 [#838]: https://github.com/stackabletech/operator-rs/pull/838
+[#843]: https://github.com/stackabletech/operator-rs/pull/843
 
 ## [0.73.0] - 2024-08-09
 

crates/stackable-operator/src/product_config_utils.rs

@@ -8,6 +8,9 @@ use tracing::{debug, error, warn};
 
 use crate::role_utils::{CommonConfiguration, Role};
 
+pub const CONFIG_OVERRIDE_FILE_HEADER_KEY: &str = "EXPERIMENTAL_FILE_HEADER";
+pub const CONFIG_OVERRIDE_FILE_FOOTER_KEY: &str = "EXPERIMENTAL_FILE_FOOTER";
+
 type Result<T, E = Error> = std::result::Result<T, E>;
 
 #[derive(Debug, PartialEq, Snafu)]