fix missing rustfmt

Author: cecton

.github/workflows/rust.yml

@@ -39,8 +39,9 @@ jobs:
           if [ "$ver" = msrv ]; then
               ver=$(cargo metadata --format-version 1 --no-deps | \
                   jq -r '.packages[0].rust_version')
+              extra=(-c rustfmt)
           fi
-          rustup toolchain install "$ver" --profile minimal --no-self-update
+          rustup toolchain install "$ver" --profile minimal --no-self-update "${extra[@]}"
           rustup default "$ver"
           echo "Installed:"
           cargo --version