workflows: initrd and kernel checks

.github/workflows/check.yml

@@ -37,3 +37,13 @@ jobs:
         components: rustfmt
     - run: ./scripts/ci/install-deps.sh
     - run: ./scripts/cargo.sh fmt --all -- --check
+  initrd:
+    name: initrd
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: dtolnay/rust-toolchain@stable
+      with:
+        targets: "x86_64-unknown-linux-gnu,x86_64-unknown-linux-musl"
+    - run: ./scripts/ci/install-deps.sh
+    - run: ./initrd/build.sh

.github/workflows/kernel.yml

@@ -0,0 +1,16 @@
+name: kernel
+on:
+  push:
+    paths:
+    - "kernel/**"
+  pull_request:
+    paths:
+    - "kernel/**"
+jobs:
+  build:
+    name: build
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - run: ./scripts/ci/install-deps.sh
+    - run: ./kernel/build.sh