add subscription for hardlink component

projects/cobbler-frontend/src/app/actions/hardlink/hardlink.component.ts

@@ -1,41 +1,49 @@
-import { Component } from '@angular/core';
+import { Component, OnDestroy } from '@angular/core';
 import { MatButton } from '@angular/material/button';
 import { MatSnackBar } from '@angular/material/snack-bar';
 import { CobblerApiService } from 'cobbler-api';
 import { UserService } from '../../services/user.service';
+import { Subscription } from 'rxjs';
 
 @Component({
   selector: 'cobbler-hardlink',
   standalone: true,
-  imports: [
-    MatButton
-  ],
+  imports: [MatButton],
   templateUrl: './hardlink.component.html',
-  styleUrl: './hardlink.component.scss'
+  styleUrl: './hardlink.component.scss',
 })
-export class HardlinkComponent {
+export class HardlinkComponent implements OnDestroy {
+  private subs: Subscription = new Subscription();
 
   constructor(
     public userService: UserService,
     private cobblerApiService: CobblerApiService,
     private _snackBar: MatSnackBar
-  ) {
+  ) {}
+
+  ngOnDestroy(): void {
+    this.subs.unsubscribe();
   }
 
   runHardlink(): void {
-    this.cobblerApiService.background_hardlink(this.userService.token).subscribe(
-      value => {
-        // TODO
-      },
-      error => {
-        // HTML encode the error message since it originates from XML
-        this._snackBar.open(this.toHTML(error.message), 'Close');
-      });
+    this.subs.add(
+      this.cobblerApiService
+        .background_hardlink(this.userService.token)
+        .subscribe({
+          next: (value) => {
+            // TODO
+          },
+          error: (error) => {
+            // HTML encode the error message since it originates from XML
+            this._snackBar.open(this.toHTML(error.message), 'Close');
+          },
+        })
+    );
   }
 
   toHTML(input: string): any {
     // FIXME: Deduplicate method
-    return new DOMParser().parseFromString(input, 'text/html').documentElement.textContent;
+    return new DOMParser().parseFromString(input, 'text/html').documentElement
+      .textContent;
   }
-
 }