feat: add custom domain

Author: xiaoyu2er

.github/actions/vercel-deploy/action.yml

@@ -14,13 +14,20 @@ inputs:
     required: true
   vercel_token:
     required: true
+  custom_domain:
+    description: "Custom domain in the format {locale}-{pr}.nextjs.im (optional)"
+    required: false
+    default: ""
 outputs:
   inspect_url:
     description: "Vercel inspect URL"
     value: ${{ steps.vercel_deploy.outputs.inspect_url }}
   prod_url:
     description: "Vercel preview/production URL"
     value: ${{ steps.vercel_deploy.outputs.prod_url }}
+  custom_domain_url:
+    description: "Custom domain URL if set"
+    value: ${{ steps.set_custom_domain.outputs.custom_domain_url }}
 runs:
   using: "composite"
   steps:
@@ -56,3 +63,15 @@ runs:
         VERCEL_PROJECT_ID: ${{ inputs.vercel_project_id }}
         VERCEL_ORG_ID: ${{ inputs.vercel_org_id }}
       shell: bash
+    - name: Set Custom Domain (if provided)
+      id: set_custom_domain
+      if: ${{ inputs.custom_domain != '' }}
+      run: |
+        deployment_url=${{ steps.vercel_deploy.outputs.prod_url }}
+        custom_domain="${{ inputs.custom_domain }}"
+        npx vercel alias set "$deployment_url" "$custom_domain" --token=${{ inputs.vercel_token }}
+        echo "custom_domain_url=https://$custom_domain" >> $GITHUB_OUTPUT
+      env:
+        VERCEL_PROJECT_ID: ${{ inputs.vercel_project_id }}
+        VERCEL_ORG_ID: ${{ inputs.vercel_org_id }}
+      shell: bash

.github/workflows/prerelease.yml

@@ -68,6 +68,7 @@ jobs:
           vercel_project_id: ${{ secrets[matrix.secret_project_id] }}
           vercel_org_id: ${{ secrets.VERCEL_ORG_ID }}
           vercel_token: ${{ secrets.VERCEL_TOKEN }}
+          custom_domain: ${{ matrix.locale }}-${{ github.event.pull_request.number }}.nextjs.im
       - name: Comment PR with Vercel Preview Links (${{ matrix.locale }})
         if: steps.should_deploy.outputs.should_deploy == 'true'
         uses: ./.github/actions/comment-vercel-preview