rust version matching my server

ht_booking/Dockerfile

@@ -17,7 +17,9 @@ COPY assets/views ./assets/views
 RUN mkdir -p assets/static/css && npm run build:css
 
 # ---- Stage 2 — release binary ----------------------------------------------
-FROM rust:1.87.0-slim AS builder
+# Latest stable Rust, pinned to Debian bookworm so the compiled binary's glibc
+# matches the bookworm-slim runtime stage below.
+FROM rust:1-slim-bookworm AS builder
 WORKDIR /usr/src
 COPY . .
 RUN cargo build --release --bin ht_booking-cli