Exclude radicle-systemd from non-linux builds — heartwood

This conditionally enables the journal feature on linux only, in order to improve the out of the box experience on other platforms (e.g. on macOS) where cargo build --workspace currently fails.

Signed-off-by: Yorgos Saslis yorgos.work@proton.me

 thiserror = { workspace = true }
 [target.'cfg(target_os = "linux")'.dependencies]
 radicle-systemd = { workspace = true, optional = true }
 radicle-systemd = { workspace = true, optional = true, features = ["journal"] }
 [target.'cfg(windows)'.dependencies]
 winpipe = { workspace = true }

 systemd-journal-logger = { version = "2.2.2", optional = true }
 [features]
 default = ["journal", "listen"]
 default = ["listen"]
 journal = ["dep:log", "dep:systemd-journal-logger"]
 listen = []
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