ci: restore x86_64 linux build files

.github/workflows/build-aarch64-unknown-linux-gnu.yaml

@@ -59,7 +59,7 @@ jobs:
         run: |
           docker run -e RELEASE_DESCRIPTION='${{ github.event.inputs.release_version }}' --name rust-linux ubuntu-builder ./build.sh
           mkdir -p build
-          docker cp rust-linux:rust/build/dist build/dist
+          docker cp rust-linux:/home/rust/rust/build/dist build/dist
       - name: Upload Release Asset
         id: upload-release-asset
         uses: actions/upload-release-asset@v1

support/rust-build/x86_64-unknown-linux-gnu/Containerfile

@@ -0,0 +1,13 @@
+FROM ubuntu:20.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+ENV LC_ALL=C.UTF-8
+ENV LANG=C.UTF-8
+RUN apt-get update \
+    && apt-get install -y vim nano git curl gcc ninja-build cmake libudev-dev python3 python3-pip libusb-1.0-0 libssl-dev \
+    pkg-config libtinfo5
+
+RUN adduser --disabled-password --gecos "" rust
+USER rust
+WORKDIR /home/rust
+COPY build.sh /home/rust/build.sh

support/rust-build/x86_64-unknown-linux-gnu/build.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+set -e
+
+git clone --recursive --depth 1 --shallow-submodules https://github.com/esp-rs/rust.git
+cd rust
+python3 src/bootstrap/configure.py --experimental-targets=Xtensa --release-channel=nightly --release-description="${RELEASE_DESCRIPTION}" --enable-extended --enable-cargo-native-static --tools=clippy,cargo,rustfmt,rust-analyzer-proc-macro-srv --dist-compression-formats='xz' --enable-lld
+python3 x.py dist --stage 2