Made it possible to add component

src/args.ts

@@ -30,7 +30,8 @@ export interface ToolchainOptions {
     name: string,
     target?: string,
     default: boolean,
-    override: boolean
+    override: boolean,
+    component?: string
 }
 
 export function toolchain_args(): ToolchainOptions {
@@ -38,6 +39,7 @@ export function toolchain_args(): ToolchainOptions {
         name: getInput('toolchain', {required: true}),
         target: getInput('target') || undefined,
         default: inputBoolean('default'),
-        override: inputBoolean('override')
+        override: inputBoolean('override'),
+        component: getInput('component') || undefined
     };
 }

src/main.ts

@@ -89,6 +89,10 @@ async function run() {
     if (opts.target) {
         await exec.exec(rustup, ['target', 'add', '--toolchain', opts.name, opts.target]);
     }
+
+    if (opts.component) {
+        await exec.exec(rustup, ['component', 'add', opts.component, '--toolchain', opts.name]);
+    }
 }
 
 async function main() {