fix(dockerfile): needs dummy db url (#1368)

Author: icecrasher321

docker/app.Dockerfile

@@ -43,6 +43,14 @@ ENV NEXT_TELEMETRY_DISABLED=1 \
     DOCKER_BUILD=1
 
 WORKDIR /app
+
+# Provide dummy database URLs during image build so server code that imports @sim/db
+# can be evaluated without crashing. Runtime environments should override these.
+ARG DATABASE_URL="postgresql://user:pass@localhost:5432/dummy"
+ARG POSTGRES_URL="postgresql://user:pass@localhost:5432/dummy"
+ENV DATABASE_URL=${DATABASE_URL}
+ENV POSTGRES_URL=${POSTGRES_URL}
+
 RUN bun run build
 
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