Update Node.js version and add environment variable

.github/workflows/build-appimage.yml

@@ -9,6 +9,9 @@ on:
     paths: [ 'AppImage/**' ]
   workflow_dispatch:  
 
+env:
+  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true
+
 jobs:
   build:
     runs-on: ubuntu-22.04
@@ -20,7 +23,7 @@ jobs:
     - name: Setup Node.js
       uses: actions/setup-node@v4
       with:
-        node-version: '20'
+        node-version: '22'
         
     - name: Install dependencies
       working-directory: AppImage