workflow: Create basic build

This builds the application using one of the Github workflows.

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

.github/workflows/build.yml

@@ -0,0 +1,44 @@
+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
+          toolchains: arm-zephyr-eabi
+            # TODO: Also bring in riscv.
+
+      - name: Build firmware
+        working-directory: zephyr-rust-lang
+        shell: bash
+        run: |
+          set -x
+          pwd
+          echo $ZEPHYR_BASE
+          df -h
+          cargo --version