add hot reload to docker

server/Dockerfile

@@ -1,8 +1,17 @@
-FROM debian:bookworm-slim
+FROM rust:bookworm AS builder
 
-WORKDIR /app
+VOLUME /build
+WORKDIR /build
 
-VOLUME /app
+FROM builder AS dev
+RUN cargo install cargo-watch
+CMD [ "cargo", "watch", "-x", "run" ]
+
+FROM builder AS build
+COPY . .
+RUN cargo install --path /build
+
+FROM debian:bookworm-slim AS prod
+COPY --from=build /usr/local/cargo/bin/webview /app/webview
 VOLUME /fonts
-
 CMD [ "/app/webview" ]