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This commit adds the ccache v4.9.1, the latest version at the moment, to the CI Docker image because the distro ccache package is relatively outdated and does not support newer features used by the zephyr-runner v2 (mainly, redis remote storage backend).
Note that the upstream ccache project does not distribute pre-compiled AArch64 binary -- for AArch64, the distro-provided ccache package will be used.