Fix: Use full Node.js image for node-sass compatibility

Changed from node:20-alpine to node:20 to include Python and build
tools required by node-sass native bindings. This resolves the
"gyp ERR! find Python" error during npm install.

.drone.yml

@@ -5,7 +5,7 @@ name: default
 steps:
   # Step 1: Install dependencies and run linting
   - name: test
-    image: node:20-alpine
+    image: node:20
     commands:
       - npm ci
       - npm run lint || echo "⚠ Linting skipped (no lint script found)"
@@ -15,7 +15,7 @@ steps:
 
   # Step 2: Build for production (to verify it compiles)
   - name: build
-    image: node:20-alpine
+    image: node:20
     commands:
       - npm ci
       - npm run build