fix: add dedicated integration job for cross-compilation tests

- Restore integration job with CI-compatible linker configuration
- Use aarch64-linux-gnu-gcc instead of aarch64-linux-musl-gcc for CI
- Enable make run-built-image test in dedicated ubuntu-latest environment

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -47,6 +47,33 @@ jobs:
     - run: make build
     - run: make test
     - run: make test-e2e
+    #- run: make run-built-image
+
+  integration:
+    name: Integration Test
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+    - uses: dtolnay/rust-toolchain@b3b07ba8b418998c39fb20f53e8b695cdcc8de1b # master
+      with:
+        toolchain: stable
+        targets: x86_64-unknown-linux-musl,aarch64-unknown-linux-musl
+    - name: Install cross-compilation tools
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y musl-tools gcc-aarch64-linux-gnu
+    - name: Setup cargo config for CI cross-compilation
+      run: |
+        mkdir -p .cargo
+        cat > .cargo/config.toml << 'EOF'
+        [target.x86_64-unknown-linux-musl]
+        linker = "x86_64-linux-musl-gcc"
+
+        [target.aarch64-unknown-linux-musl]
+        linker = "aarch64-linux-gnu-gcc"
+        EOF
+    - run: make verify-cross-compile
+    - run: make build
     - run: make run-built-image
 
   fmt: