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The `docker-init` binary is not intended to be a user-facing command, and as such it is more appropriate for it to be found in `/usr/libexec` (or similar) than in `PATH` (see the FHS, especially https://refspecs.linuxfoundation.org/FHS_3.0/fhs/ch04s07.html and https://refspecs.linuxfoundation.org/FHS_2.3/fhs-2.3.html#USRLIBLIBRARIESFORPROGRAMMINGANDPA). This adjusts the logic for using that configuration option to take this into account and appropriately search for `docker-init` (or the user's configured alternative) in these directories before falling back to the existing `PATH` lookup behavior. This behavior _used_ to exist for the old `dockerinit` binary (of a similar name and used in a similar way but for an alternative purpose), but that behavior was removed in4357ed4a73when that older `dockerinit` was also removed. Most of this reasoning _also_ applies to `docker-proxy` (and various `containerd-xxx` binaries such as the shims), but this change does not affect those. It would be relatively straightforward to adapt `LookupInitPath` to be a more generic function such as `libexecLookupPath` or similar if we wanted to explore that. See14482589df/cli-plugins/manager/manager_unix.gofor the related path list in the CLI which loads CLI plugins from a similar set of paths (with a similar rationale - plugin binaries are not typically intended to be run directly by users but rather invoked _via_ the CLI binary). Signed-off-by: Tianon Gravi <admwiggin@gmail.com>