Update Dockerfile

Dockerfile

@@ -10,8 +10,8 @@ COPY . .
 # run release build
 RUN cargo build --release
 
-# create final container using slim version of debian
-FROM debian:buster-slim
+# create final container using rust
+FROM rust:latest
 
 # microbin will be in /usr/local/bin/microbin/
 WORKDIR /usr/local/bin