fix(dockerfile): build issue related to asserting existence of next public app url

[icecrasher321]

Summary

Build issue related to asserting existence of next public app url

Type of Change

• Bug fix

Testing

Wil test in CI

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Preview	Comments	Updated (UTC)
docs	Ready	Preview	Comment	Oct 15, 2025 9:25pm

[greptile-apps]

Greptile Overview

Summary

Fixed Docker build failure caused by missing NEXT_PUBLIC_APP_URL environment variable during the build stage. The build process requires this variable because next.config.ts accesses env.NEXT_PUBLIC_APP_URL, which triggers validation through @t3-oss/env-nextjs.

The fix follows the existing pattern established for DATABASE_URL by providing a dummy value during build time that runtime environments can override with actual values.

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• The fix follows the exact same pattern already established for DATABASE_URL in the same Dockerfile. It provides a dummy environment variable during build time that will be overridden at runtime. The approach is consistent, well-commented, and solves a critical build failure without introducing any new risks.
• No files require special attention

Important Files Changed

File Analysis

Filename	Score	Overview
docker/app.Dockerfile	5/5	Added NEXT_PUBLIC_APP_URL dummy env var for build-time to prevent validation errors in next.config.ts

Sequence Diagram

sequenceDiagram
participant Docker as Docker Build
participant Dockerfile as app.Dockerfile
participant NextJS as Next.js Build
participant EnvSchema as env.ts (t3-oss)
participant NextConfig as next.config.ts
Docker->>Dockerfile: Start build stage
Dockerfile->>Dockerfile: Set DATABASE_URL dummy
Dockerfile->>Dockerfile: Set NEXT_PUBLIC_APP_URL dummy
Dockerfile->>NextJS: Run `bun run build`
NextJS->>NextConfig: Load next.config.ts
NextConfig->>EnvSchema: Import env (triggers validation)
EnvSchema->>EnvSchema: Validate NEXT_PUBLIC_APP_URL (required)
Note over EnvSchema: With fix: validates successfully<br/>Without fix: throws error
EnvSchema-->>NextConfig: Return validated env
NextConfig->>NextConfig: Access env.NEXT_PUBLIC_APP_URL (lines 85-93, 115)
NextConfig-->>NextJS: Return config
NextJS->>NextJS: Complete build
NextJS-->>Docker: Build artifacts ready

Loading

_{1 file reviewed, no comments}

_{Edit Code Review Agent Settings | Greptile}