Add CASPER_NODE_ADDRESS env var.

This makes it easier to use multiple commands without remembering to set
`--node-address`. With this change casper-client will try to load its
value from env variable `CASPER_NODE_ADDRESS`.

Cargo.toml

@@ -30,7 +30,7 @@ async-trait = { version = "0.1.74", optional = true }
 base16 = "0.2.1"
 casper-hashing = "3.0.0"
 casper-types = { version = "4.0.1", features = ["std"] }
-clap = { version = "~4.4", optional = true, features = ["cargo", "deprecated", "wrap_help"] }
+clap = { version = "~4.4", optional = true, features = ["cargo", "deprecated", "wrap_help", "env"] }
 clap_complete = { version = "<4.5.0", optional = true }
 hex-buffer-serde = "0.4.0"
 humantime = "2.1.0"

src/common.rs

@@ -52,6 +52,7 @@ pub mod node_address {
         Arg::new(ARG_NAME)
             .long(ARG_NAME)
             .short(ARG_SHORT)
+            .env("CASPER_NODE_ADDRESS")
             .required(false)
             .default_value(ARG_DEFAULT)
             .value_name(ARG_VALUE_NAME)