optimize the production dockerfile to produce a 2.5MB image

filed/Cargo.toml

@@ -23,3 +23,7 @@ sha2 = "0.10.8"
 static_dir = "0.2.0"
 tokio = { version = "1.32.0", features = ["rt", "macros", "rt-multi-thread"] }
 warp = "0.3.6"
+
+[profile.release]
+opt-level = 'z'
+lto = true

filed/Dockerfile.prod

@@ -4,10 +4,13 @@ FROM rust:alpine as builder
 WORKDIR /opt/build
 COPY . .
 
+RUN apk add --no-cache musl-dev upx
+
 RUN cargo b -r
+RUN strip target/release/filed && upx --best target/release/filed
 
 # --- deploy ---
-FROM alpine
+FROM busybox:musl
 
 COPY --from=builder /opt/build/target/release/filed /bin/filed
 CMD [ "/bin/filed" ]