refactor: move vendored writer to config/writer, drop framework module

Relocates the vendored Flask config writer from
framework/flask_app_config_writer to config/writer, matching hdfs-operator's
config/writer.rs convention (no operator keeps a vendored writer under
framework/, which trino reserves for v2 upstream mirrors). Converts config.rs
into a config/ module. No behaviour change.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: adwk67

rust/operator-binary/src/airflow_controller.rs

@@ -72,7 +72,10 @@ use stackable_operator::{
 use strum::{EnumDiscriminants, IntoStaticStr};
 
 use crate::{
-    config::{self, PYTHON_IMPORTS},
+    config::{
+        self, PYTHON_IMPORTS,
+        writer::{self, FlaskAppConfigWriterError},
+    },
     controller_commons::{self, CONFIG_VOLUME_NAME, LOG_CONFIG_VOLUME_NAME, LOG_VOLUME_NAME},
     crd::{
         self, AIRFLOW_CONFIG_FILENAME, APP_NAME, AirflowClusterStatus, AirflowConfig,
@@ -91,7 +94,6 @@ use crate::{
         v1alpha2,
     },
     env_vars::{self, build_airflow_template_envs},
-    framework::flask_app_config_writer::{self, FlaskAppConfigWriterError},
     operations::{
         graceful_shutdown::{
             add_airflow_graceful_shutdown_config, add_executor_graceful_shutdown_config,
@@ -770,14 +772,10 @@ fn build_rolegroup_config_map(
 
     let temp_file_footer: Option<String> = config.remove(CONFIG_OVERRIDE_FILE_FOOTER_KEY);
 
-    flask_app_config_writer::write::<AirflowConfigOptions, _, _>(
-        &mut config_file,
-        config.iter(),
-        PYTHON_IMPORTS,
-    )
-    .with_context(|_| BuildRoleGroupConfigFileSnafu {
-        rolegroup: rolegroup.clone(),
-    })?;
+    writer::write::<AirflowConfigOptions, _, _>(&mut config_file, config.iter(), PYTHON_IMPORTS)
+        .with_context(|_| BuildRoleGroupConfigFileSnafu {
+            rolegroup: rolegroup.clone(),
+        })?;
 
     if let Some(footer) = temp_file_footer {
         writeln!(config_file, "{}", footer).context(WriteToConfigFileStringSnafu)?;

rust/operator-binary/src/config.rs rust/operator-binary/src/config/mod.rsrust/operator-binary/src/config.rs renamed to rust/operator-binary/src/config/mod.rs

@@ -1,3 +1,5 @@
+pub mod writer;
+
 use std::collections::BTreeMap;
 
 use indoc::formatdoc;

…src/framework/flask_app_config_writer.rs rust/operator-binary/src/config/writer.rsrust/operator-binary/src/framework/flask_app_config_writer.rs renamed to rust/operator-binary/src/config/writer.rs rust/operator-binary/src/framework/flask_app_config_writer.rs renamed to rust/operator-binary/src/config/writer.rs

@@ -45,6 +45,7 @@ use stackable_operator::{
 use strum::{Display, EnumIter, EnumString, IntoEnumIterator};
 
 use crate::{
+    config::writer::{FlaskAppConfigOptions, PythonType},
     crd::{
         affinity::{get_affinity, get_executor_affinity},
         authentication::{
@@ -55,7 +56,6 @@ use crate::{
             CeleryBrokerConnection, CeleryResultBackendConnection, MetadataDatabaseConnection,
         },
     },
-    framework::flask_app_config_writer::{FlaskAppConfigOptions, PythonType},
     util::role_service_name,
 };
 

rust/operator-binary/src/crd/mod.rs

@@ -44,7 +44,6 @@ mod controller;
 mod controller_commons;
 mod crd;
 mod env_vars;
-mod framework;
 mod operations;
 mod product_logging;
 mod service;