CI: devkita64 container + apt nodejs (like other OmniNX jobs)

- Use devkitpro/devkita64 for Switch (not devkitARM).
- apt install nodejs before checkout so actions/checkout works in container.
- Add workflow_dispatch; keep PR/push to main and master.
- upload-artifact@v4.

Made-with: Cursor

.github/workflows/build.yml

@@ -5,37 +5,31 @@ on:
     branches: [main, master]
   pull_request:
     branches: [main, master]
+  workflow_dispatch:
 
 jobs:
   switch:
+    name: Build
     runs-on: ubuntu-latest
+    container:
+      # Switch homebrew uses devkitA64 + libnx (not devkitARM)
+      image: devkitpro/devkita64:latest
     permissions:
       contents: read
 
-    env:
-      DEVKITPRO: /opt/devkitpro
-
     steps:
+      # actions/checkout needs Node; devkitPro images omit it by default
+      - name: Install dependencies
+        run: apt-get update && apt-get install -y nodejs
+
       - name: Checkout
         uses: actions/checkout@v4
-
-      # Install toolchain on the runner (no nested docker). Nested `docker run -v
-      # "$GITHUB_WORKSPACE"` fails under act: the mount points at an empty path.
-      - name: Install devkitPro
-        run: |
-          set -euo pipefail
-          wget -q -U "dkp-apt" -O ./install-devkitpro-pacman https://apt.devkitpro.org/install-devkitpro-pacman
-          chmod +x ./install-devkitpro-pacman
-          yes | sudo ./install-devkitpro-pacman
-          sudo dkp-pacman -Sy
-          sudo dkp-pacman -S switch-dev --noconfirm
-
-      - name: Add devkitPro tools to PATH
-        run: |
-          echo "/opt/devkitpro/devkitA64/bin" >> "$GITHUB_PATH"
-          echo "/opt/devkitpro/tools/bin" >> "$GITHUB_PATH"
+        with:
+          clean: true
 
       - name: Compile (Switch .nro)
+        env:
+          DEVKITPRO: /opt/devkitpro
         run: make -j$(nproc)
 
       - name: Upload .nro artifact