GH actions: initial commit.

.github/workflows/c-cpp.yml

@@ -0,0 +1,52 @@
+name: SteamWorks.ext Build
+
+on:
+  push:
+    branches: [ master, windows98 ]
+  pull_request:
+    branches: [ master, windows98 ]
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        python-version: [2.7, 3.3, 3.8]
+        os: [ubuntu-18.04, macos-latest, windows-2019]
+        exclude:
+         - os: macos-latest
+           python-version: 3.3
+         - os: windows-2019
+           python-version: 3.3
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install Deps
+      if: runner.os == 'Linux'
+      run: |
+        sudo dpkg --add-architecture i386
+        sudo apt-get install lib32stdc++-7-dev lib32z1-dev libc6-dev-i386
+        sudo apt-get install g++-multilib
+    - name: install AMBuild
+      run: |
+        mkdir assets
+        cd assets
+        git clone --depth 1 --recurse-submodules -j8 --shallow-submodules -b fix-deps https://github.com/alliedmodders/ambuild.git
+        pip install ./ambuild
+    - name: Clone Dependencies
+      run: |
+        git clone --depth 1 --recurse-submodules -j8 --shallow-submodules https://[email protected]/SteamDatabase/SteamworksSDK.git SteamworksSDK
+        git clone --depth 1 --recurse-submodules -j8 --shallow-submodules -b sdk2013 https://github.com/alliedmodders/hl2sdk.git hl2sdk-sdk2013
+        git clone --depth 1 --recurse-submodules -j8 --shallow-submodules -b 1.10-dev https://github.com/alliedmodders/metamod-source.git mmsource-central
+        git clone --depth 1 --recurse-submodules -j8 --shallow-submodules -b 1.7-dev https://github.com/alliedmodders/sourcemod.git sourcemod-central
+    - name: Run Build
+      run: |
+        mkdir build
+        cd build
+        cp ../AMBuildScript ../../
+        python ../configure.py -s sdk2013 --hl2sdk-root ../assets --sm-path ../assets/sourcemod-central --mms-path ../assets/mmsource-central --steamworks-path ../assets/SteamworksSD
+        ambuild