Rename the coins folder to networks (#583)

* Rename the coins folder to networks

Ethereum isn't a coin. It's a network.

Resolves #357.

* More renames of coins -> networks in orchestration

* Correct paths in tests/

* cargo fmt

orchestration/src/networks/ethereum/consensus/nimbus.rs

@@ -0,0 +1,49 @@
+use crate::Network;
+
+pub fn nimbus(network: Network) -> (String, String, String) {
+  assert_ne!(network, Network::Dev);
+
+  let platform = match std::env::consts::ARCH {
+    "x86_64" => "amd64",
+    "arm" => "arm32v7",
+    "aarch64" => "arm64v8",
+    _ => panic!("unsupported platform"),
+  };
+
+  #[rustfmt::skip]
+  let checksum = match platform {
+    "amd64" => "5da10222cfb555ce2e3820ece12e8e30318945e3ed4b2b88d295963c879daeee071623c47926f880f3db89ce537fd47c6b26fe37e47aafbae3222b58bcec2fba",
+    "arm32v7" => "7055da77bfa1186ee2e7ce2a48b923d45ccb039592f529c58d93d55a62bca46566ada451bd7497c3ae691260544f0faf303602afd85ccc18388fdfdac0bb2b45",
+    "arm64v8" => "1a68f44598462abfade0dbeb6adf10b52614ba03605a8bf487b99493deb41468317926ef2d657479fcc26fce640aeebdbd880956beec3fb110b5abc97bd83556",
+    _ => panic!("unsupported platform"),
+  };
+
+  #[rustfmt::skip]
+  let download_nimbus = format!(r#"
+FROM alpine:latest as nimbus
+
+ENV NIMBUS_VERSION=24.3.0
+ENV NIMBUS_COMMIT=dc19b082
+
+# Download nimbus
+RUN wget https://github.com/status-im/nimbus-eth2/releases/download/v${{NIMBUS_VERSION}}/nimbus-eth2_Linux_{platform}_${{NIMBUS_VERSION}}_${{NIMBUS_COMMIT}}.tar.gz
+
+# Extract nimbus
+RUN tar xvf nimbus-eth2_Linux_{platform}_${{NIMBUS_VERSION}}_${{NIMBUS_COMMIT}}.tar.gz
+RUN mv nimbus-eth2_Linux_{platform}_${{NIMBUS_VERSION}}_${{NIMBUS_COMMIT}}/build/nimbus_beacon_node ./nimbus
+
+# Verify the checksum
+RUN sha512sum nimbus | grep {checksum}
+"#);
+
+  let run_nimbus = format!(
+    r#"
+COPY --from=nimbus --chown=ethereum nimbus /bin
+
+ADD /orchestration/{}/networks/ethereum/consensus/nimbus/run.sh /consensus_layer.sh
+"#,
+    network.label()
+  );
+
+  (download_nimbus, String::new(), run_nimbus)
+}