switch: add github workflow

.github/workflows/switch.yml

@@ -0,0 +1,30 @@
+name: Build (Nintendo Switch)
+
+on: [push, pull_request]
+
+jobs:
+  n3ds:
+    runs-on: ubuntu-latest
+    container:
+      image: devkitpro/devkita64:latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Configure
+        run: |
+          source /opt/devkitpro/devkita64/switchvars.sh \
+          mkdir _build && cd _build \
+          ../configure --host=aarch64-none-elf \
+              --prefix=switch-sdl2 \
+              --disable-shared --enable-static \
+              --enable-audio \
+              --enable-joystick \
+              --disable-power \
+              --disable-filesystem \
+              --enable-cpuinfo \
+              --enable-pthreads \
+              --enable-timers \
+              --enable-video
+      - name: Build
+        run: make 
+      - name: install
+        run: make -C _build install