Infra Update `v4`: Support `spack.repos`, Add Tiered Common Configuration Via `spack.include` - #20

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Commits on Sep 16, 2026

build-ci@v4 migration: Simplify manifests to use local included config, deprecate spack-packages/datafile workflow inputs

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Commits on Sep 18, 2026

Moved from propagating toolchain to all.require toolchain due to spack bug

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Copilot
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