Add github actions

.github/workflows/build_master.yml

@@ -0,0 +1,34 @@
+name: Compile Master Branch
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+  release:
+    types: [ created ]
+
+jobs:
+  build:
+    name: Compile ${{ matrix.prog }} for ${{ matrix.dist }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        dist: [ubuntu_x86_64, macos_x86_64, win_x86_64]
+        prog: [ctrtool, makerom]
+        include:
+         - dist: win_x86_64
+           os: windows-2016
+           binExt: .exe
+         - dist: ubuntu_x86_64
+           os: ubuntu-latest
+         - dist: macos_x86_64
+           os: macos-latest
+    steps:
+    - uses: actions/checkout@v1
+    - name: Compile ${{ matrix.prog }}
+      run: cd ${{ matrix.prog }}; make ${{ matrix.makeArgs }};
+    - uses: actions/upload-artifact@v2
+      with:
+        name: ${{ matrix.prog }}-${{ matrix.dist }}
+        path: ${{ matrix.prog }}/${{ matrix.prog }}${{ matrix.binExt }}