Build example on CI

.github/workflows/test.yml

@@ -42,3 +42,23 @@ jobs:
         run: cppcheck --quiet --error-exitcode=1 --std=c99 --enable=warning,style,performance,portability --suppress=duplicateExpression --suppress=staticStringCompare examples/
       - name: cppcheck tests
         run: cppcheck --quiet --error-exitcode=1 --std=c99 --enable=warning,style,performance,portability --suppress=unusedStructMember tests/
+
+  # TODO: finish this
+  example-kernel-multiboot2-grub:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: dependencies
+        run: sudo apt install build-essential qemu-system-x86 wget
+      - name: vendor-fetch
+        run: ./vendor/fetch.sh
+      - name: vendor-cross-build
+        run: ./vendor/cross/build/i386/build.sh
+      - name: autogen
+        run: ./autogen.sh
+      - name: configure
+        run: PATH="$(pwd)/vendor/cross/bin:$PATH" ./config/i386
+      - name: make
+        run: make libkernaux.a
+      - name: make-example
+        run: cd 'examples/kernel-multiboot2-grub' && make image.iso