### Overview
This commit introduces a broad set of improvements across the defaults
generator, credential creation subsystem, inventory creation workflow,
and InventoryManager core logic.
### Major Changes
- Support empty or config/main.yml in defaults generator and ensure that
applications with empty configs are still included in defaults_applications.
- Add '--snippet' and '--allow-empty-plain' modes to create/credentials.py
with non-destructive merging and correct plain-secret handling.
- Ensure empty strings for 'plain' credentials are never encrypted.
- Update InventoryManager to fully support allow_empty_plain and prevent
accidental overwriting or encrypting existing VaultScalar or dict values.
- Add full-size implementation of cli/create/inventory.py including
dynamic inventory building, role filtering, host_vars management, and
parallelised credential snippet generation.
- Fix schemas (Magento, Nextcloud, OAuth2-Proxy, keyboard-color, etc.) to
align with the new credential model and avoid test failures.
- Improve get_app_conf consistency by ensuring credentials.* paths are
always resolvable for applications even when config/main.yml is empty.
### Added Test Coverage
- Unit tests for defaults generator handling empty configs.
- Full test suite for create/inventory.py including merge logic and
vault-safe host_vars loading.
- Extensive tests for InventoryManager: plain-secret behavior,
vault handling, and recursion logic.
- Update or remove outdated tests referencing old schema behaviour.
### Context
This commit is associated with a refactoring and debugging session documented here:
https://chatgpt.com/share/692ec0e1-5018-800f-b568-d09a53e9d0ee
Add end-to-end support for reserved usernames and tighten CAPTCHA / Keycloak logic.
Changes:
- Makefile: rename EXTRA_USERS → RESERVED_USERNAMES and pass it as --reserved-usernames to the users defaults generator.
- cli/build/defaults/users.py: propagate flag into generated users, add --reserved-usernames CLI option and mark listed accounts as reserved.
- Add reserved_users filter plugin with and helpers for Ansible templates and tasks.
- Add unit tests for reserved_users filters and the new reserved-usernames behaviour in the users defaults generator.
- group_vars/all/00_general.yml: harden RECAPTCHA_ENABLED / HCAPTCHA_ENABLED checks with default('') and explicit > 0 length checks.
- svc-db-openldap: introduce OPENLDAP_PROVISION_* flags, add OPENLDAP_PROVISION_RESERVED and OPERNLDAP_USERS to optionally exclude reserved users from provisioning.
- svc-db-openldap templates/tasks: switch role/group LDIF and user import loops to use OPERNLDAP_USERS instead of the full users dict.
- networks: assign dedicated subnet for web-app-roulette-wheel.
- web-app-keycloak vars: compute KEYCLOAK_RESERVED_USERNAMES_LIST and KEYCLOAK_RESERVED_USERNAMES_REGEX from users | reserved_usernames.
- web-app-keycloak user profile template: inject reserved-username regex into username validation pattern and improve error message, fix SSH public key attribute usage and add component name field.
- web-app-keycloak update/_update.yml: strip subComponents from component payloads before update and disable async/poll for easier debugging.
- web-app-keycloak tasks/main.yml: guard cleanup include with MODE_CLEANUP and keep reCAPTCHA update behind KEYCLOAK_RECAPTCHA_ENABLED.
- user/users defaults: mark system/service accounts (root, daemon, mail, admin, webmaster, etc.) as reserved so they cannot be chosen as login names.
- svc-prx-openresty vars: simplify OPENRESTY_CONTAINER lookup by dropping unused default parameter.
- sys-ctl-rpr-btrfs-balancer: simplify main.yml by removing the extra block wrapper.
- sys-daemon handlers: quote handler name for consistency.
Context: change set discussed and refined in ChatGPT on 2025-11-29 (Infinito.Nexus reserved usernames & Keycloak user profile flow). See conversation: https://chatgpt.com/share/692b21f5-5d98-800f-8e15-1ded49deddc9
- Added sorting by application key and user key before YAML output.
- Ensures stable and reproducible file generation across runs.
- Added comprehensive unit tests verifying key order and output stability.
See: https://chatgpt.com/share/68ef4778-a848-800f-a50b-a46a3b878797
