From 45605c803b2c546954979f393a3fbd219f3fa31d Mon Sep 17 00:00:00 2001
From: m <paragraphenreiter@gmail.com>
Date: Wed, 25 Mar 2026 15:53:32 +0100
Subject: [PATCH] fix: pass NEXT_PUBLIC_* env vars as build args for Supabase
 client

Next.js inlines NEXT_PUBLIC_* vars at build time. They must be
available as ARGs during the Docker build, not just as runtime
environment variables.
---
 docker-compose.yml  | 3 +++
 frontend/Dockerfile | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/docker-compose.yml b/docker-compose.yml
index bc0b325..5830274 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -22,6 +22,9 @@ services:
   frontend:
     build:
       context: ./frontend
+      args:
+        NEXT_PUBLIC_SUPABASE_URL: ${SUPABASE_URL}
+        NEXT_PUBLIC_SUPABASE_ANON_KEY: ${SUPABASE_ANON_KEY}
     expose:
       - "3000"
     depends_on:
diff --git a/frontend/Dockerfile b/frontend/Dockerfile
index 531034c..e6ed41b 100644
--- a/frontend/Dockerfile
+++ b/frontend/Dockerfile
@@ -10,6 +10,10 @@ WORKDIR /app
 COPY --from=deps /app/node_modules ./node_modules
 COPY . .
 ENV API_URL=http://backend:8080
+ARG NEXT_PUBLIC_SUPABASE_URL
+ARG NEXT_PUBLIC_SUPABASE_ANON_KEY
+ENV NEXT_PUBLIC_SUPABASE_URL=$NEXT_PUBLIC_SUPABASE_URL
+ENV NEXT_PUBLIC_SUPABASE_ANON_KEY=$NEXT_PUBLIC_SUPABASE_ANON_KEY
 RUN mkdir -p public
 RUN bun run build