Update docker-image.yml

Explicitly set up Node.js 20 in GitHub Actions workflow

Author: filikun

.github/workflows/docker-image.yml

@@ -11,6 +11,11 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
+    - name: Set up Node.js 20
+      uses: actions/setup-node@v3
+      with:
+        node-version: '20'
+
     - name: Checkout repository
       uses: actions/checkout@v3