How can I use GitHub Actions with Vercel CLi while using turborepo?

i have multiple apps in my turborepo and each app has a separate project created in vercel. Each of the apps uses the same Database, where we are using Neon as the database provider and Prisma to manage migrations.

Here's our current CI/CD pipeline

1name: Deploy Preview23on: [pull_request]45env:6  NEON_API_KEY: ${{ secrets.NEON_API_KEY }}7  NEON_MAIN_BRANCH_NAME: ${{ secrets.NEON_MAIN_BRANCH_NAME }}8  NEON_PROJECT_ID: ${{ secrets.NEON_PROJECT_ID }}9  PG_DATABASE: ${{ secrets.PG_DATABASE }}10  PG_USERNAME: ${{ secrets.PG_USERNAME }}11  VERCEL_TOKEN: ${{ secrets.VERCEL_TOKEN }}12  VERCEL_TEAM_ID: ${{ secrets.VERCEL_TEAM_ID }}1314jobs:15  deploy-preview:16    permissions: write-all17    runs-on: ubuntu-latest18    strategy:19      matrix:20        app: [web,admin]21    outputs:22      web_preview_url: ${{ steps.deploy.outputs.web_preview_url }}23      admin_preview_url: ${{ steps.deploy.outputs.admin_preview_url }}24      neon_branch_id: ${{ steps.create-branch.outputs.branch_id }}2526    steps:27      - name: Get branch name28        id: branch-name29        uses: tj-actions/branch-names@v83031      - uses: actions/checkout@v432        with:33          ref: ${{ steps.branch-name.outputs.current_branch }}3435      - name: Create Neon Branch36        id: create-branch37        uses: neondatabase/create-branch-action@v538        with:39          project_id: ${{ env.NEON_PROJECT_ID }}40          # parent: dev # optional (defaults to your primary branch)41          branch_name: preview/pr-${{ github.event.number }}-${{ steps.branch-name.outputs.current_branch }}42          username: ${{ env.PG_USERNAME }}43          api_key: ${{ env.NEON_API_KEY }}4445      - name: Update environment variables46        run: |47          touch .env48          echo DATABASE_URL=${{ steps.create-branch.outputs.db_url_with_pooler }} >> .env4950      - name: Install Vercel51        run: npm install --global vercel@34.2.55253      - name: Link Vercel to GitHub Repository54        run: vercel link --repo --yes --scope=${{ env.VERCEL_TEAM_ID}} --token=${{ env.VERCEL_TOKEN }}5556      - name: Pull Vercel Environment Information57        run: |58          if [ "${{ matrix.app }}" == "web" ]; then59            vercel pull --yes --scope=${{ env.VERCEL_TEAM_ID}} --environment=preview --token=${{ env.VERCEL_TOKEN }} --cwd apps/web60          elif [ "${{ matrix.app }}" == "admin" ]; then61            vercel pull --yes --scope=${{ env.VERCEL_TEAM_ID}} --environment=preview --token=${{ env.VERCEL_TOKEN }} --cwd apps/admin62          fi6364      - name: Build Project Artifacts65        run: |66          if [ "${{ matrix.app }}" == "web" ]; then67            vercel build --scope=${{ env.VERCEL_TEAM_ID}} --token=${{ env.VERCEL_TOKEN }} --cwd apps/web68          elif [ "${{ matrix.app }}" == "admin" ]; then69            vercel build --scope=${{ env.VERCEL_TEAM_ID}} --token=${{ env.VERCEL_TOKEN }} --cwd apps/admin70          fi7172      - name: Deploy Preview to Vercel73        id: deploy74        run: |75          if [ "${{ matrix.app }}" == "web" ]; then76          echo web_preview_url=$(vercel deploy --prebuilt --env DATABASE_URL=${{ steps.create-branch.outputs.db_url_with_pooler }} --scope=${{ env.VERCEL_TEAM_ID}} --token=${{ env.VERCEL_TOKEN }} --cwd apps/web) >> $GITHUB_OUTPUT77          elif [ "${{ matrix.app }}" == "admin" ]; then78          echo admin_preview_url=$(vercel deploy --prebuilt --env DATABASE_URL=${{ steps.create-branch.outputs.db_url_with_pooler }} --scope=${{ env.VERCEL_TEAM_ID}} --token=${{ env.VERCEL_TOKEN }} --cwd apps/admin) >> $GITHUB_OUTPUT79          fi8081  comment-preview:82    runs-on: ubuntu-latest83    needs: deploy-preview84    steps:85      - name: Comment on Pull Request86        uses: thollander/actions-comment-pull-request@v287        with:88          # GITHUB_TOKEN: ${{ env.GH_TOKEN }}89          message: |90            VERCEL Web Preview URL :rocket: : ${{ needs.deploy-preview.outputs.web_preview_url }}91            VERCEL Admin Preview URL :rocket: : ${{ needs.deploy-preview.outputs.admin_preview_url }}92            Neon branch :elephant: : https://console.neon.tech/app/projects/${{ env.NEON_PROJECT_ID }}/branches/${{ needs.deploy-preview.outputs.neon_branch_id }}93

2 things to note from the snippet above

We are updating the DATABASE_URL env value generated from neon database
After deployment is completed we are commenting on the PR with deployment url

The problem with the current approach

We are building common packages twice (defeats the purpose of using turborepo)
Prisma migrations must be ran on both the apps in parallel (Although, I would be somehow be able to avoid it in and run it only once ). Sometimes the builds fails because of this

I cannot use turbo build command since I wouldn't be able to dynamically update env variable, access deployment url etc which the vercel cli provides with.

It would be good to have more options in the vercel cli to support this, similar to the --repo flag that was introduced some time back. https://vercel.com/docs/cli/link#repo-alpha

References: https://vercel.com/guides/how-can-i-use-github-actions-with-vercel