ci: Add cargo to pre-commit image (#7835)

.github/workflows/build-pre-commit-image.yml

@@ -7,10 +7,12 @@ on:
     paths:
       - ".github/workflows/build-pre-commit-image.yml"
       - "bin/pre-commit/Dockerfile"
+      - "rust-toolchain.toml"
   pull_request:
     paths:
       - ".github/workflows/build-pre-commit-image.yml"
       - "bin/pre-commit/Dockerfile"
+      - "rust-toolchain.toml"
   workflow_dispatch:
 
 concurrency:

bin/pre-commit/Dockerfile

@@ -37,3 +37,19 @@ ENV NIX_SSL_CERT_FILE="/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt
 
 # Verify nix installation
 RUN nix --version
+
+ENV RUSTUP_HOME="/opt/rust/rustup"
+ENV CARGO_HOME="/opt/rust/cargo"
+ENV PATH="/opt/rust/cargo/bin:${PATH}"
+
+WORKDIR /tmp
+COPY rust-toolchain.toml /tmp/rust-toolchain.toml
+RUN <<EOF
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs \
+    | sh -s -- -y --no-modify-path --profile minimal --default-toolchain none
+rustup toolchain install
+rustup show
+cargo fmt --version
+EOF
+
+WORKDIR /