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backend_rust/Dockerfile

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+# Build stage
+FROM rust:1.84-alpine AS builder
+
+RUN apk add --no-cache musl-dev pkgconfig openssl-dev
+
+WORKDIR /app
+
+# Copy manifests
+COPY Cargo.toml Cargo.lock ./
+COPY migration/Cargo.toml ./migration/
+
+# Create dummy files to build dependencies
+RUN mkdir src && echo "fn main() {}" > src/main.rs
+RUN mkdir -p migration/src && echo "fn main() {}" > migration/src/main.rs && echo "" > migration/src/lib.rs
+
+# Build dependencies only
+RUN cargo build --release
+
+# Remove dummy files
+RUN rm -rf src migration/src
+
+# Copy actual source code
+COPY src ./src
+COPY migration/src ./migration/src
+
+# Build the actual application
+RUN touch src/main.rs migration/src/main.rs migration/src/lib.rs
+RUN cargo build --release
+
+# Runtime stage
+FROM alpine:3.21
+
+RUN apk add --no-cache ca-certificates libgcc
+
+WORKDIR /app
+
+# Copy the binary from builder
+COPY --from=builder /app/target/release/backend_rust /app/backend_rust
+COPY --from=builder /app/target/release/migration /app/migration
+
+# Create uploads directory
+RUN mkdir -p /app/uploads/avatars
+
+EXPOSE 4000
+
+CMD ["/app/backend_rust"]