add github actions

.github/FUNDING.yml

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+ patreon: hartie95

.github/workflows/overlay.yml

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+name: SysDVR-Overlay
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [ master ]
+    paths:
+  pull_request:
+    branches: [ master ]
+    paths:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    container: devkitpro/devkita64:latest
+
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        submodules: recursive
+    - name: Run build script
+      run: |
+        ./build.sh
+    - uses: actions/upload-artifact@v3
+      with:
+        name: SysDVR-Overlay-dev
+        path: release/*/.overlays/*.ovl

build.sh

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+#!/bin/bash
+echo "cleaning up before"
+rm -r release
+make clean
+echo "building"
+make -j4
+result=$?
+
+if [ $result -eq 0 ]
+then
+  echo "creating package"
+  mkdir -p "release/switch/.overlays"
+  mv "sysdvr-overlay.ovl" "release/switch/.overlays"
+  echo "done"
+else
+  echo "build failed" >&2
+  exit $result
+fi