Switch to alpine, add healthcheck command, update rust version, build…

… now optimized version.

Dockerfile

@@ -1,13 +1,15 @@
-FROM rust:1.70.0 as builder
+FROM rust:1.78.0-alpine3.19 as builder
 
 WORKDIR /usr/src/rust-tz-service
 COPY . .
 
-RUN --mount=type=cache,target=/usr/local/cargo/registry cargo install --path .
+RUN apk add libc-dev
+RUN --mount=type=cache,target=/usr/local/cargo/registry cargo build --release
 
-FROM debian:bullseye-slim
-RUN apt-get update && rm -rf /var/lib/apt/lists/*
-COPY --from=builder /usr/local/cargo/bin/rust-tz-service /usr/local/bin/rust-tz-service
+FROM alpine:3.19
+RUN apk --no-cache add curl
+COPY --from=builder /usr/src/rust-tz-service/target/release/rust-tz-service /usr/local/bin/rust-tz-service
 
 ENV RUST_LOG=info
-CMD ["rust-tz-service"]
+HEALTHCHECK CMD curl --fail http://localhost:8080/health || exit 1
+CMD rust-tz-service