feat: remove DATABASE_URL from Vercel deployment workflow environment variables

.github/workflows/deploy-preview.yml

@@ -0,0 +1,42 @@
+name: Vercel Preview Deployment
+
+env:
+  VERCEL_ORG_ID: ${{ secrets.VERCEL_ORG_ID }}
+  VERCEL_PROJECT_ID: ${{ secrets.VERCEL_PROJECT_ID }}
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Vercel CLI
+        run: npm install --global vercel@latest
+
+      - name: Pull Vercel Environment Information
+        run: vercel pull --yes --environment=preview --token=${{ secrets.VERCEL_TOKEN }}
+
+      - name: Build Project Artifacts
+        run: vercel build --token=${{ secrets.VERCEL_TOKEN }}
+
+      - name: Deploy Project Artifacts to Vercel
+        id: deploy
+        run: echo "url=$(vercel deploy --prebuilt --token=${{ secrets.VERCEL_TOKEN }})" >> $GITHUB_OUTPUT
+
+      - name: Comment Preview URL on PR
+        uses: actions/github-script@v7
+        with:
+          script: |
+            github.rest.issues.createComment({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: `🔍 **Preview deployment ready!**\n\n${{ steps.deploy.outputs.url }}`
+            })
+