The rust:1.88-trixie image already provides cargo, rustc, clippy,
rustfmt, git, and build-essential. Dropping the manual rustup install
keeps the runner pinned to the same toolchain as the release Dockerfile.

Assisted-by: Claude Opus 4.7 via Claude Code

diff --git a/.quire/Dockerfile b/.quire/Dockerfile
index 224e3b6..d649dbd 100644
--- a/.quire/Dockerfile
+++ b/.quire/Dockerfile
@@ -1,15 +1,9 @@
-FROM debian:trixie
+FROM rust:1.88-trixie
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
     bc \
-    build-essential \
-    ca-certificates \
-    curl \
-    git \
     grcov \
     jq \
     && rm -rf /var/lib/apt/lists/*
 
-RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal --component clippy,llvm-tools-preview,rustfmt
-
-ENV PATH="/root/.cargo/bin:${PATH}"
+RUN rustup component add llvm-tools-preview