Revert "fix: Automatically install nightly toolchain when missing"

This reverts commit d4b5d93.

Author: syphar

src/config.rs

@@ -119,7 +119,6 @@ pub struct Config {
     pub(crate) build_cpu_limit: Option<u32>,
     pub(crate) build_default_memory_limit: Option<usize>,
     pub(crate) include_default_targets: bool,
-    #[allow(dead_code)]
     pub(crate) disable_memory_limit: bool,
 
     // automatic rebuild configuration

src/docbuilder/rustwide_builder.rs

@@ -299,34 +299,10 @@ impl RustwideBuilder {
     }
 
     pub fn add_essential_files(&mut self) -> Result<()> {
-        // Check if toolchain is available, install if needed
-        match self.detect_rustc_version() {
-            Ok(_) => {
-                info!("Toolchain is already installed");
-            }
-            Err(err) => {
-                // Check if the error is specifically due to missing toolchain
-                let err_msg = err.to_string();
-                if err_msg.contains("No such file or directory")
-                    || err_msg.contains("command not found")
-                    || err_msg.contains("not installed")
-                {
-                    info!("Installing nightly toolchain because it was not found");
-                    self.update_toolchain()?;
-                } else {
-                    // Don't try to install the toolchain if some other error occurred
-                    return Err(anyhow!(
-                        "Failed to detect rustc version: {}\n\nThis might indicate the nightly toolchain is not properly installed. Please run 'cratesfyi build update-toolchain' first.",
-                        err
-                    ));
-                }
-            }
-        }
-
         let rustc_version = self.rustc_version()?;
         let parsed_rustc_version = parse_rustc_version(&rustc_version)?;
 
-        info!("building a dummy crate to get essential files for {rustc_version}");
+        info!("building a dummy crate to get essential files");
 
         let limits = self.get_limits(DUMMY_CRATE_NAME)?;