workflow: Create basic build of rust samples

Build the rust code samples to make sure that Rust support is working on
all supported targets.  This adds toolchain support and rust target
support for the supported Cortex-M, and RISC-V targets.

The workflow runs on every pull request and on every push.

Signed-off-by: David Brown <[email protected]>

.github/workflows/build.yml

@@ -0,0 +1,55 @@
+# Copyright (c) 2024 Linaro LTD
+# SPDX-License-Identifier: Apache-2.0
+
+name: Build
+
+# Build the rust samples and tests using the current Zephyr.
+
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: "0 0 * * *"
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-22.04]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          path: zephyr-rust-lang
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: 3.11
+
+      - name: Setup Zephyr project
+        uses: zephyrproject-rtos/action-zephyr-setup@v1
+        with:
+          app-path: zephyr-rust-lang
+          manifest-file-name: ci-manifest.yml
+          toolchains: arm-zephyr-eabi:riscv64-zephyr-elf
+
+      - name: Install Rust Targets
+        shell: bash
+        run: |
+          rustup target add riscv32i-unknown-none-elf
+          rustup target add riscv64imac-unknown-none-elf
+          rustup target add thumbv6m-none-eabi
+          rustup target add thumbv7em-none-eabi
+          rustup target add thumbv7m-none-eabi
+          rustup target add thumbv8m.main-none-eabi
+
+      - name: Build firmware
+        working-directory: zephyr-rust-lang
+        shell: bash
+        run: |
+          cargo --version
+
+          west twister -T samples -v --inline-logs --integration

ci-manifest.yml

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+# Copyright (c) 2021 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+# Although this normally lives as a module, the local CI uses action-zephyr-setup which wants the
+# application to have a manifest.
+
+manifest:
+  remotes:
+    - name: zephyrproject-rtos
+      url-base: https://github.com/zephyrproject-rtos
+
+  projects:
+    - name: zephyr
+      remote: zephyrproject-rtos
+      revision: main
+      import:
+        # By using name-allowlist we can clone only the modules that are
+        # strictly needed by the application.
+        name-allowlist:
+          - cmsis      # required by the ARM port
+          - hal_nordic # required by the custom_plank board (Nordic based)
+          - hal_stm32  # required by the nucleo_f302r8 board (STM32 based)