chore: fix desktop workflow

.github/workflows/desktop.dev.yml

@@ -7,12 +7,11 @@ on:
     paths:
       - packages/desktop/**
   workflow_dispatch:
+  pull_request:
+    paths:
+      - packages/desktop/**
 
 jobs:
-  setup:
-    steps:
-      - run: yarn install
-      - run: yarn build:web:front
   build:
     runs-on: ubuntu-latest
     defaults:
@@ -24,6 +23,8 @@ jobs:
         with:
           node-version: '14.x'
           registry-url: 'https://registry.npmjs.org'
+      - run: yarn install
+      - run: yarn build:web:front
       - run: node scripts/build.mjs appimage-x64
       - uses: actions/upload-artifact@v2
         with: