fix(docker): bust cache to rebuild with correct SUPABASE_URL

CACHE_BUST=1→2 forces Docker to re-run 'pnpm install' and 'next build'
so NEXT_PUBLIC_SUPABASE_URL=https://myeasycms.frontieralgorithmics.de
gets baked into the client-side JS bundle.

Dockerfile

@@ -4,7 +4,7 @@ WORKDIR /app
 
 # --- Install + Build in one stage ---
 FROM base AS builder
-ARG CACHE_BUST=1
+ARG CACHE_BUST=2
 COPY . .
 RUN pnpm install --no-frozen-lockfile
 ENV NEXT_TELEMETRY_DISABLED=1