Update Dockerfile

Dockerfile

@@ -1,3 +1,5 @@
+# syntax=docker/dockerfile:1
+
 # ==========================
 # Stage 1: Build
 # ==========================
@@ -5,36 +7,87 @@ FROM rust:1.88-slim-bookworm AS builder
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
     pkg-config \
+    ca-certificates \
     && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /build
 
+# Depcache
 COPY Cargo.toml Cargo.lock* ./
 RUN mkdir src && echo 'fn main() {}' > src/main.rs && \
     cargo build --release 2>/dev/null || true && \
     rm -rf src
 
+# Build
 COPY . .
 RUN cargo build --release && strip target/release/telemt
 
 # ==========================
-# Stage 2: Runtime
+# Stage 2: Compress (strip + UPX)
 # ==========================
-FROM debian:bookworm-slim
+FROM debian:12-slim AS minimal
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    upx \
+    binutils \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY --from=builder /build/target/release/telemt /telemt
+
+RUN strip /telemt || true
+RUN upx --best --lzma /telemt || true
+
+# ==========================
+# Stage 3: Debug base
+# ==========================
+FROM debian:12-slim AS debug-base
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
     ca-certificates \
+    tzdata \
+    curl \
+    iproute2 \
+    busybox \
     && rm -rf /var/lib/apt/lists/*
 
-RUN useradd -r -s /usr/sbin/nologin telemt
+# ==========================
+# Stage 4: Debug image
+# ==========================
+FROM debug-base AS debug
 
 WORKDIR /app
 
-COPY --from=builder /build/target/release/telemt /app/telemt
+COPY --from=minimal /telemt /app/telemt
 COPY config.toml /app/config.toml
 
-RUN chown -R telemt:telemt /app
+USER root
-USER telemt
+
+EXPOSE 443
+EXPOSE 9090
+EXPOSE 9091
+
+ENTRYPOINT ["/app/telemt"]
+CMD ["config.toml"]
+
+# ==========================
+# Stage 5: Production (distroless)
+# ==========================
+FROM gcr.io/distroless/base-debian12 AS prod
+
+WORKDIR /app
+
+COPY --from=minimal /telemt /app/telemt
+COPY config.toml /app/config.toml
+
+# TLS + timezone + shell
+COPY --from=debug-base /etc/ssl/certs /etc/ssl/certs
+COPY --from=debug-base /usr/share/zoneinfo /usr/share/zoneinfo
+COPY --from=debug-base /bin/busybox /bin/busybox
+
+RUN ["/bin/busybox", "--install", "-s", "/bin"]
+
+# distroless user
+USER nonroot:nonroot
 
 EXPOSE 443
 EXPOSE 9090