Add macOS build GitHub Actions

.github/workflows/cmake-mac.yml

@@ -0,0 +1,53 @@
+name: macOS build
+
+on: [push, pull_request]
+
+env:
+  # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
+  BUILD_TYPE: Release
+
+jobs:
+  build:
+    name: CMake, macOS
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Install dependencies
+        run: brew install autoconf automake cmake ffmpeg jansson libao libvorbis mpg123
+
+      - name: Cache celt
+        uses: actions/cache@v2
+        with:
+          path: |
+            ${{ github.workspace }}/dependencies/celt-0061
+            ${{ github.workspace }}/dependencies/celt-0110
+            ${{ github.workspace }}/build/dependencies/celt-0061/libcelt/.libs
+            ${{ github.workspace }}/build/dependencies/celt-0110/libcelt/.libs
+          key: mac-celt-${{ hashFiles('cmake/dependencies/celt.cmake') }}
+
+      - name: Cache atrac9
+        uses: actions/cache@v2
+        with:
+          path: ${{ github.workspace }}/build/dependencies/LibAtrac9/bin
+          key: mac-atrac9-${{ hashFiles('cmake/dependencies/atrac9.cmake') }}
+
+      - name: Cache g719
+        uses: actions/cache@v2
+        with:
+          path: ${{ github.workspace }}/build/dependencies/libg719_decode/libg719_decode.a
+          key: mac-g719-${{ hashFiles('cmake/dependencies/g719.cmake') }}
+
+      - name: Build
+        run: |
+          export LIBRARY_PATH=$(brew --prefix)/lib
+          cmake -S . -B build -DBUILD_AUDACIOUS:BOOL=OFF -DCMAKE_BUILD_TYPE=$BUILD_TYPE
+          cmake --build build
+
+      - name: Upload CLI tools artifact
+        uses: actions/upload-artifact@v2
+        with:
+          path: ${{ github.workspace }}/build/cli/vgmstream-cli
+          name: vgmstream-cli

.gitignore

@@ -1,6 +1,7 @@
 .*
 !/.gitignore
 !.gitattributes
+!.github
 *.user
 *.o
 *.a