Ensure new health endpoint builds on MacOS (#1215)

* Add mac build to CI

* Always return an error for Health when not linux

* Change macos workflow

* Rename macos tests

* Disable health API test on Mac

Co-authored-by: Michael Sproul <michael@sigmaprime.io>

common/rest_types/Cargo.toml

@@ -14,5 +14,7 @@ state_processing = { path = "../../consensus/state_processing" }
 bls = { path = "../../crypto/bls" }
 serde = { version = "1.0.110", features = ["derive"] }
 rayon = "1.3.0"
+
+[target.'cfg(target_os = "linux")'.dependencies]
 psutil = "3.1.0"
 procinfo = "0.4.2"

common/rest_types/src/node.rs

@@ -1,10 +1,11 @@
 //! Collection of types for the /node HTTP
-use procinfo::pid;
-use psutil::process::Process;
 use serde::{Deserialize, Serialize};
 use ssz_derive::{Decode, Encode};
 use types::Slot;
 
+#[cfg(target_os = "linux")]
+use {procinfo::pid, psutil::process::Process};
+
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Encode, Decode)]
 /// The current syncing status of the node.
 pub struct SyncingStatus {
@@ -63,6 +64,12 @@ pub struct Health {
 }
 
 impl Health {
+    #[cfg(not(target_os = "linux"))]
+    pub fn observe() -> Result<Self, String> {
+        Err("Health is only available on Linux".into())
+    }
+
+    #[cfg(target_os = "linux")]
     pub fn observe() -> Result<Self, String> {
         let process =
             Process::current().map_err(|e| format!("Unable to get current process: {:?}", e))?;