chore(deploy.yml): use v2 env and checkout master (#83)

.github/workflows/deploy.yml

@@ -8,7 +8,7 @@ on:
 jobs:
   deploy:
     runs-on: ubuntu-latest
-    environment: master
+    environment: v2
 
     steps:
       - uses: actions/checkout@v4
@@ -20,7 +20,7 @@ jobs:
           ssh -o StrictHostKeyChecking=no ${{ secrets.VPS_USER }}@${{ secrets.VPS_IP }} << 'EOF'
             export HISTFILE=/dev/null
             cd campaign-site
-            git checkout v2
+            git checkout master
             echo "Pulling changes..."
             git pull
             echo "Building and starting..."