feat(cache): add additional_caches config for custom asset cache paths

[Soner (shyim)]

Summary

• Adds additional_caches config option under build.zip.assets in .shopware-extension.yml
• Allows extensions to cache/restore custom output paths alongside standard admin/storefront assets
• Custom source paths are included in content hashing for cache key generation
• Validates that source_paths is required for each entry

Example config

build:
  zip:
    assets:
      additional_caches:
        - path: Resources/public/custom
          source_paths:
            - Resources/app/custom/src

Test plan

• Verify config parsing with additional_caches entries
• Verify validation rejects entries with empty source_paths
• Test cache store/restore with custom paths enabled (SHOPWARE_CLI_EXPERIMENTAL_ASSET_CACHING=1)

[Copilot]

Pull request overview

Adds support for caching/restoring additional custom asset output directories for extensions via a new build.zip.assets.additional_caches config option, integrating it into asset source discovery, cache-key hashing, and cache store/restore.

Changes:

• Extend .shopware-extension.yml schema/config model with build.zip.assets.additional_caches entries.
• Include additional_caches[].source_paths in asset content hashing to influence cache keys.
• Store/restore extra cached folders alongside standard administration/storefront caches.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
shopware-extension-schema.json	Adds schema definitions for build.zip.assets.additional_caches.
internal/extension/config.go	Adds config structs for additional_caches and validates source_paths non-empty.
internal/extension/project.go	Propagates additional_caches from extension config into discovered asset.Sources.
internal/extension/asset.go	Converts extension config additional_caches into asset.AdditionalCache for sources.
internal/asset/source.go	Extends asset.Source to carry AdditionalCaches and defines AdditionalCache type.
internal/extension/asset_config.go	Incorporates source_paths from additional caches into GetContentHash() input collection and maps source caches into runtime config.
internal/extension/asset_cache.go	Stores/restores additional cached folders and enables caching even when only additional_caches are present.

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