Updated docker file for better caching

Dockerfile

@@ -1,11 +1,18 @@
-FROM docker.io/rust:alpine as builder
-WORKDIR /build/pass_manager
-RUN apk -U upgrade --no-cache && apk add --no-cache musl-dev
-COPY . .
-RUN cargo install --path .
+FROM rust:slim AS chef
+RUN cargo install cargo-chef 
+WORKDIR /app
 
-FROM docker.io/alpine
-WORKDIR /app/
-RUN apk -U upgrade --no-cache
-COPY --from=builder /usr/local/cargo/bin/pass_manager .
+FROM chef AS planner
+COPY . .
+RUN cargo chef prepare
+
+FROM chef AS builder
+COPY --from=planner /app/recipe.json recipe.json
+RUN cargo chef cook --release
+COPY . .
+RUN cargo b -r
+
+FROM debian:buster-slim
+WORKDIR /app
+COPY --from=builder /app/target/release/pass_manager .
 CMD [ "./pass_manager" ]