Use Rust via the rustup toolchain

.config/setup/04-install-deb-packages.sh

@@ -14,8 +14,6 @@ DEB_PKGS=(
     bluez
     borgbackup
     build-essential
-    cargo
-    cargo-doc
     catatonit
     curl
     direnv
@@ -72,8 +70,6 @@ DEB_PKGS=(
     ripgrep
     rr
     rsync
-    rust-doc
-    rust-llvm
     shellcheck
     slurp
     speedtest-cli

.config/setup/06-install-rust-toolchain.sh

@@ -0,0 +1,11 @@
+#! /usr/bin/bash
+
+set -euo pipefail
+IFS=$'\n\t'
+
+tmpfile="$(mktemp)"
+curl --fail --proto '=https' --show-error --silent --tlsv1.2 --output "${tmpfile}" https://sh.rustup.rs && \
+    sh "${tmpfile}" --no-modify-path -y && \
+    chmod o-rwx ~/.cargo/bin/*
+    rm "${tmpfile}" && \
+    rustup component add llvm-tools