ci: add a workflow for bootloader

Signed-off-by: Changyuan Lyu <changyuanl@google.com>

Author: Lencerf

.github/workflows/bootloader.yml

@@ -0,0 +1,38 @@
+name: Build Bootloader
+
+on:
+  workflow_dispatch:
+  workflow_call:
+  pull_request:
+    branches: ["main"]
+    paths:
+      - bootloader/**
+      - .github/workflows/bootloader.yml
+
+jobs:
+  build_bootloader:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: ubuntu-latest
+            artifact_path: target/bootloader-x86_64/linux/arch/x86/boot/bzImage
+            artifact_name: bootloader-x86_64
+          - os: ubuntu-24.04-arm
+            artifact_path: target/bootloader-aarch64/linux/arch/arm64/boot/Image
+            artifact_name: bootloader-aarch64
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+      - uses: actions/setup-go@7a3fe6cf4cb3a834922a1244abfce67bcef6a0c5 # v6.2.0
+        with:
+          go-version: "stable"
+      - name: Install dependencies
+        run: apt-get update && apt-get install -y llvm libelf-dev
+      - name: Build bootloader
+        run: ./bootloader/build.sh
+      - name: Upload artifact
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
+        with:
+          name: ${{ matrix.artifact_name }}
+          path: ${{ matrix.artifact_path }}