ci: add Rust compiler suite

tools/ci/cibuild.sh

@@ -37,7 +37,7 @@ EXTRA_PATH=
 
 case ${os} in
   Darwin)
-    install="python-tools u-boot-tools elf-toolchain gen-romfs kconfig-frontends arm-gcc-toolchain riscv-gcc-toolchain xtensa-esp32-gcc-toolchain avr-gcc-toolchain c-cache binutils"
+    install="python-tools u-boot-tools elf-toolchain gen-romfs kconfig-frontends arm-gcc-toolchain riscv-gcc-toolchain xtensa-esp32-gcc-toolchain avr-gcc-toolchain c-cache binutils rust"
     mkdir -p "${prebuilt}"/homebrew
     export HOMEBREW_CACHE=${prebuilt}/homebrew
     # https://github.com/actions/virtual-environments/issues/2322#issuecomment-749211076
@@ -46,7 +46,7 @@ case ${os} in
     brew update --quiet
     ;;
   Linux)
-    install="python-tools gen-romfs gperf kconfig-frontends arm-gcc-toolchain mips-gcc-toolchain riscv-gcc-toolchain xtensa-esp32-gcc-toolchain rx-gcc-toolchain sparc-gcc-toolchain c-cache"
+    install="python-tools gen-romfs gperf kconfig-frontends arm-gcc-toolchain mips-gcc-toolchain riscv-gcc-toolchain xtensa-esp32-gcc-toolchain rx-gcc-toolchain sparc-gcc-toolchain c-cache rust"
     ;;
 esac
 
@@ -363,6 +363,24 @@ function binutils {
   fi
 }
 
+function rust {
+  mkdir -p "${prebuilt}"/rust/bin
+  add_path "${prebuilt}"/rust/bin
+
+  if ! type rustc &> /dev/null; then
+    case ${os} in
+      Darwin)
+        brew install rust
+        ;;
+      Linux)
+        # Currently Debian installed rustc doesn't support 2021 edition.
+        export CARGO_HOME=${prebuilt}/rust
+        curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+        ;;
+    esac
+  fi
+}
+
 function usage {
   echo ""
   echo "USAGE: $0 [-i] [-s] [-c] [-*] <testlist>"

tools/ci/docker/linux/Dockerfile

@@ -228,6 +228,7 @@ RUN apt-get update -qq && DEBIAN_FRONTEND="noninteractive" apt-get install -y -q
   python3 \
   python3-pip \
   python-is-python3 \
+  rustc \
   u-boot-tools \
   unzip \
   wget \