Add rust-toolchain check to Dockerfile

Author: coolreader18

crates/standalone/Dockerfile

@@ -1,12 +1,17 @@
-# Warning: we removed binstall recently because they added a dependency on the QUIC protocol.
-
 ARG CARGO_PROFILE=release
 
 
 FROM rust:1.74.0 AS chef
+# ensure  ^^^^^^ and rust-toolchain.toml are in sync
+ADD rust-toolchain.toml .
+RUN if [[ $(awk '/^channel = "[0-9\.]+"$/{gsub(/"/, "", $3); print $3}' rust-toolchain.toml) != "$RUST_VERSION" ]]; \
+      echo "Docker base doesn't match rust-toolchain.toml"; exit 1; \
+    else rm -f rust-toolchain.toml; fi
+
 RUN rust_target=$(rustc -vV | awk '/^host:/{ print $2 }') && \
   curl https://github.com/cargo-bins/cargo-binstall/releases/latest/download/cargo-binstall-$rust_target.tgz -fL | tar xz -C $CARGO_HOME/bin
 RUN cargo binstall -y [email protected]
+
 WORKDIR /usr/src/app
 
 FROM chef AS planner