Rust multistage build (#550)

* fix get request not accepted

* use mutli-stage docker build to minimize final image

Co-authored-by: Minghe <h.minghe@gmail.com>

assets/dockerfiles/base/rust/Dockerfile

@@ -1,7 +1,12 @@
-FROM liuchong/rustup
-
-WORKDIR /usr/src/myapp
+FROM clux/muslrust:nightly AS builder
+WORKDIR /build
 COPY . .
-RUN cp ./config ~/.cargo/ && rustup default nightly && cargo build
+RUN ln -s /usr/bin/g++ /usr/bin/musl-g++ && cargo build --release
+
+FROM scratch
+WORKDIR /usr/src/myapp
+COPY --from=builder /build/target/x86_64-unknown-linux-musl/release/rust /usr/src/myapp/
+COPY ./Rocket.toml /usr/src/myapp/
 EXPOSE 3000
-CMD ["cargo", "run"]
+ENV ROCKET_ENV=prod
+CMD ["/usr/src/myapp/rust"]

assets/dockerfiles/base/rust/Rocket.toml

@@ -1,5 +1,23 @@
 [development]
+address = "localhost"
+port = 3000
+workers = 8
+keep_alive = 5
+log = "normal"
+limits = { forms = 32768 }
+
+[staging]
 address = "0.0.0.0"
 port = 3000
+workers = 8
+keep_alive = 5
 log = "normal"
+limits = { forms = 32768 }
 
+[production]
+address = "0.0.0.0"
+port = 3000
+workers = 8
+keep_alive = 5
+log = "critical"
+limits = { forms = 32768 }