Enhance YAML loading with custom tags support and error handling

[mstrhakr]

This pull request enhances Docker Compose YAML parsing in the Compose Manager by adding support for custom YAML tags (!override, !reset, !merge). It introduces a custom schema for jsyaml to handle these tags robustly and refactors YAML loading throughout the codebase to use this schema. Additionally, a unit test is added to ensure the custom tag support is present in the source.

YAML Parsing Improvements:

• Added buildComposeYamlSchema and loadComposeYaml functions to define and use a custom jsyaml schema supporting the !override, !reset, and !merge tags for all YAML kinds (scalar, sequence, mapping). (source/compose.manager/include/ComposeManager.php)
• Refactored all YAML loading (jsyaml.load) calls in the codebase to use the new loadComposeYaml function, ensuring consistent handling of custom tags. (source/compose.manager/include/ComposeManager.php) [1] [2] [3]

Testing:

• Added a unit test to verify that the custom tag schema and related functions are present in the generated page source. (tests/unit/ComposeManagerMainSourceTest.php)Title: Pull request summary

What changed
Short summary of changes and rationale.

Related issues
Closes # (if applicable)

Checklist

• I have added/updated tests where applicable
• I have updated documentation (docs/, README, or plugin docs)
• Linted/formatted the code
• Verified on Unraid or CI

Testing notes
How to test locally (commands, env vars).

Notes
For issue #81 - [Bug]: Override Tag Causes Yaml Error

[Copilot]

Pull request overview

This PR addresses YAML parsing failures in the Compose Manager UI when Docker Compose custom YAML tags (!override, !reset, !merge) are present, by introducing a shared js-yaml schema + loader and refactoring call sites to use it.

Changes:

• Added buildComposeYamlSchema() + cached loadComposeYaml() wrapper around jsyaml.load with custom tag support.
• Updated YAML parsing call sites (profiles generation, labels parsing, editor validation) to use loadComposeYaml().
• Added a source-level unit test asserting the custom-tag schema helpers are present in ComposeManager.php.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
source/compose.manager/include/ComposeManager.php	Introduces custom js-yaml schema/loader and routes key YAML parses through it.
tests/unit/ComposeManagerMainSourceTest.php	Adds a source-level assertion that the custom-tag support is declared.

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