feat: image builder action trial

.github/lint/workflows/build-raspi4.yaml

@@ -0,0 +1,32 @@
+---
+name: sd-image-rpi4
+on:
+  workflow_dispatch:
+
+jobs:
+  build-sd-image:
+    name: Build Raspi4 image
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4.1.1
+      - uses: cachix/install-nix-action@v23
+        with:
+          nix_path: nixpkgs=channel:nixos-23.05
+          extra_nix_config: |
+            extra-platforms = aarch64-linux
+      - name: Check nix.conf
+        run: cat /etc/nix/nix.conf
+      - name: Register binfmt
+        run: |
+          docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
+      - name: Test binfmt availability
+        run: |
+          cat /proc/sys/fs/binfmt_misc/qemu-aarch64
+        shell: bash
+      - name: Build SD Image
+        run: |
+          nix build .#image.rip4
+      - uses: actions/upload-artifact@v3
+        with:
+          name: rpi4.img
+          path: ./result/sd-image/*.img*