раскидал структуру для монорепозитория

backend/Dockerfile

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+FROM rust:1.83 AS builder
+
+WORKDIR /app
+
+COPY Cargo.toml Cargo.lock ./
+RUN mkdir src && echo "fn main() {}" > src/main.rs
+RUN cargo build --release
+RUN rm -rf src
+
+COPY src ./src
+RUN touch src/main.rs
+RUN cargo build --release
+
+FROM debian:bookworm-slim
+
+RUN apt-get update && apt-get install -y \
+    libssl3 \
+    ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY --from=builder /app/target/release/family_budget .
+
+ENV RUST_LOG=info
+
+EXPOSE 8080
+
+CMD ["./family_budget"]