feat: add headless arg to install

Author: mattsse

crates/svm-rs/src/bin/svm-bin/install.rs

@@ -8,6 +8,10 @@ use semver::Version;
 pub struct InstallCmd {
     /// Solc versions to install.
     pub versions: Vec<String>,
+
+    /// Run in headless mode without prompting for user input.
+    #[arg(long, default_value_t = false)]
+    pub headless: bool,
 }
 
 impl InstallCmd {
@@ -21,6 +25,9 @@ impl InstallCmd {
 
             if installed_versions.contains(&version) {
                 println!("Solc {version} is already installed");
+                if self.headless {
+                    continue;
+                }
                 let input: String = Input::new()
                     .with_prompt("Would you like to set it as the global version?")
                     .with_initial_text("Y")