Make stores and schedulers lists of named specs

[aaronmondal]

To migrate, change your config like this (similar for schedulers):

// Old:
"stores": {
  "SOMESTORE": {
    "memory": {}
  }
}

// New:
"stores": [
  {
    "name": "SOMESTORE",
    "memory": {}
  }
]

Closes #834

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This change is 

[aaronmondal]

+@allada

Reviewable status: 0 of 1 LGTMs obtained, and 0 of 14 files reviewed, and pending CI: Bazel Dev / macos-13, Bazel Dev / macos-14, Bazel Dev / ubuntu-24.04, Cargo Dev / macos-13, Cargo Dev / ubuntu-22.04, Coverage, Installation / macos-13, Installation / macos-14, Installation / ubuntu-22.04, Local / ubuntu-22.04, NativeLink.com Cloud / Remote Cache / macos-14, NativeLink.com Cloud / Remote Cache / ubuntu-24.04, Publish image, Publish nativelink-worker-init, Publish nativelink-worker-lre-cc, Remote / large-ubuntu-22.04, Web Platform Deployment / macos-14, Web Platform Deployment / ubuntu-24.04, asan / ubuntu-22.04, docker-compose-compiles-nativelink (22.04), integration-tests (22.04), macos-13, pre-commit-checks, ubuntu-20.04 / stable, ubuntu-22.04, ubuntu-22.04 / stable, windows-2022 / stable (waiting on @allada)

[MarcusSorealheis]

This is amazing but will obviously need a lot of testing.

We also need to document a migration path.

[allada]

Reviewable status: 0 of 1 LGTMs obtained, and 0 of 14 files reviewed, and pending CI: Remote / large-ubuntu-22.04, and 1 discussions need to be resolved

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nativelink-config/src/cas_server.rs line 728 at r1 (raw file):

    /// List of stores available to use in this config.
    /// The keys can be used in other configs when needing to reference a store.
    pub stores: Vec<StoreConfig>,

Lets make this backwards compatible by making it a custom type that is a wrapper around Vec<StoreConfig>, but has a custom decoder that will be able to translate either Vec<StoreConfig> or Map<StoreRefName, StoreSpec> and throw a runtime deprecation warning if the user needs to migrate.

[aaronmondal]

We also need to document a migration path.

Done. Using the old config scheme now prints a big warning message with an example of how to migrate.

Reviewable status: 0 of 1 LGTMs obtained, and 0 of 17 files reviewed, and pending CI: Coverage, Local / ubuntu-22.04, Publish image, Publish nativelink-worker-init, Web Platform Deployment / macos-14, Web Platform Deployment / ubuntu-24.04, docker-compose-compiles-nativelink (22.04), integration-tests (22.04), pre-commit-checks, ubuntu-20.04 / stable, ubuntu-22.04 / stable, vale, and 1 discussions need to be resolved (waiting on @allada)

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nativelink-config/src/cas_server.rs line 728 at r1 (raw file):

Previously, allada (Nathan (Blaise) Bruer) wrote…

Lets make this backwards compatible by making it a custom type that is a wrapper around Vec<StoreConfig>, but has a custom decoder that will be able to translate either Vec<StoreConfig> or Map<StoreRefName, StoreSpec> and throw a runtime deprecation warning if the user needs to migrate.

Done.