Refactor Dockerfile to use Rust for building doh-proxy instead of Go

Author: lygris

Dockerfile

@@ -1,27 +1,22 @@
 # --- Build Stage ---
-# Use the official Go image to build the application
-FROM golang:1.21-alpine AS builder
-
-# Install Git, which is needed to download the source code
-RUN apk add --no-cache git
+# Use the official Rust image to compile the application
+FROM rust:latest AS builder
 
+# Create a new, empty project
 WORKDIR /app
 
-# Download and compile the doh-server application
-RUN go install github.com/dnscrypt/doh-server/cmd/doh-server@latest
+# Install the doh-proxy binary. The --no-default-features flag is crucial
+# as it builds the version without built-in HTTPS, which is what we need
+# when running behind a reverse proxy like Nginx.
+RUN cargo install doh-proxy --no-default-features
 
 
 # --- Final Stage ---
-# Use a minimal Alpine image for the final container
+# Use a minimal Alpine image for a small final container size
 FROM alpine:latest
 
-WORKDIR /app
-
-# Copy the compiled doh-server application from the build stage
-COPY --from=builder /go/bin/doh-server .
-
-# Expose the internal port the server will listen on
-EXPOSE 8053
+# Copy the compiled doh-proxy application from the build stage
+COPY --from=builder /usr/local/cargo/bin/doh-proxy /usr/local/bin/
 
 # Set the command to run when the container starts
-ENTRYPOINT [ "./doh-server" ]
+ENTRYPOINT [ "doh-proxy" ]