cli: Add `--config` option to `rad self`

rad.1.adoc

@@ -189,6 +189,12 @@ description and default branch by running:
 
     $ rad inspect --payload
 
+=== Configuration
+
+Radicle keeps a configuration file at *~/.radicle/config.json* by default. To
+display its exact location on your system, you can use the *rad self --config*
+command.
+
 === Environment
 
 Various environment variables are used by *rad*.

radicle-cli/src/commands/self.rs

@@ -22,6 +22,7 @@ Options
     --nid                Show your Node ID (NID)
     --did                Show your DID
     --home               Show your Radicle home
+    --config             Show the location of your configuration file
     --ssh-key            Show your public key in OpenSSH format
     --ssh-fingerprint    Show your public key fingerprint in OpenSSH format
     --help               Show help
@@ -34,6 +35,7 @@ enum Show {
     NodeId,
     Did,
     Home,
+    Config,
     SshKey,
     SshFingerprint,
     All,
@@ -65,6 +67,9 @@ impl Args for Options {
                 Long("home") if show.is_none() => {
                     show = Some(Show::Home);
                 }
+                Long("config") if show.is_none() => {
+                    show = Some(Show::Config);
+                }
                 Long("ssh-key") if show.is_none() => {
                     show = Some(Show::SshKey);
                 }
@@ -103,6 +108,9 @@ pub fn run(options: Options, ctx: impl term::Context) -> anyhow::Result<()> {
         Show::Home => {
             term::print(profile.home().display());
         }
+        Show::Config => {
+            term::print(profile.home.config().display());
+        }
         Show::SshKey => {
             term::print(ssh::fmt::key(profile.id()));
         }