Fix Railway Docker volume build

Dockerfile

@@ -5,13 +5,14 @@ WORKDIR /src
 COPY go.mod go.sum ./
 RUN go mod download
 COPY . .
-RUN CGO_ENABLED=0 go build -ldflags="-s -w" -o /out/urapt-server ./cmd/urapt-server \
+RUN mkdir -p /out/data/store \
+ && CGO_ENABLED=0 go build -ldflags="-s -w" -o /out/urapt-server ./cmd/urapt-server \
  && CGO_ENABLED=0 go build -ldflags="-s -w" -o /out/urapt ./cmd/urapt
 
 FROM gcr.io/distroless/static-debian12:nonroot
 COPY --from=build /out/urapt-server /usr/local/bin/urapt-server
+COPY --from=build --chown=nonroot:nonroot /out/data /data
 EXPOSE 8080
-VOLUME ["/data"]
 ENV URAPT_STORE_DIR=/data/store
 ENV URAPT_BASE_URL=http://localhost:8080
 USER nonroot:nonroot