optimize dockerfile to cache build-tools

Signed-off-by: Tianyue Ren <rentianyue-jk@360shuke.com>

docker/Dockerfile

@@ -1,8 +1,5 @@
 FROM alpine:3.18.2 AS builder
 
-COPY Cargo.* /tmp/iptoasn/
-COPY src /tmp/iptoasn/src
-
 WORKDIR /tmp/iptoasn
 
 RUN apk add --update --no-cache ca-certificates \
@@ -12,18 +9,23 @@ RUN apk add --update --no-cache ca-certificates \
   && apk add --no-cache --virtual .build-rust \
     rust \
     cargo \
-    libressl-dev \
-  \
-  && cargo build --release \
-  && strip target/release/iptoasn-webservice \
-  && mv target/release/iptoasn-webservice /usr/bin/iptoasn-webservice \
-  && adduser -D app \
-  \
-  && apk del .build-rust \
-  && rm -rf  ~/.cargo \
-            /var/cache/apk/* \
-            /tmp/*
+    libressl-dev
 
+COPY Cargo.* /tmp/iptoasn/
+COPY src /tmp/iptoasn/src
+
+RUN cargo build --release \
+  && strip target/release/iptoasn-webservice
+
+FROM alpine:3.18.2 as prod
+
+RUN apk add --update --no-cache ca-certificates \
+                                libressl \
+                                llvm-libunwind \
+                                libgcc \
+    && adduser -D app
+
+COPY --from=0 /tmp/iptoasn/target/release/iptoasn-webservice /usr/bin/iptoasn-webservice
 COPY docker/iptoasn-entrypoint.sh /iptoasn-entrypoint.sh
 RUN chmod +x /iptoasn-entrypoint.sh