Add Github Actions

.github/workflows/ci.yml

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+name:  CI
+
+on:
+  push:
+    branches: [ dev, g_rescript ]
+  pull_request:
+    branches: [ dev, g_rescript ]
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, ubuntu-latest, windows-latest]
+
+    runs-on: ${{matrix.os}}
+
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        path: ninja
+
+    - name: Use Node.js
+      uses: actions/setup-node@v3
+      with:
+        node-version: 16
+
+    - name: "Windows: Use MSVC"
+      if: runner.os == 'Windows'
+      uses: TheMrMilchmann/setup-msvc-dev@v1
+      with:
+        arch: x64
+
+    - name: Run snapshot.js
+      run: |
+        node createBinDir.js
+        node snapshot.js
+      working-directory: ninja
+
+    - name: Get artifact info
+      id: get_artifact_info
+      run: node ninja/.github/workflows/get_artifact_info.js
+
+    - name: Upload artifacts
+      uses: actions/upload-artifact@v3
+      with:
+        name: ${{ steps.get_artifact_info.outputs.artifact_name }}
+        path: ${{ steps.get_artifact_info.outputs.artifact_path }}

.github/workflows/get_artifact_info.js

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+const artifactPath =
+  process.platform === "darwin"
+    ? process.platform + process.arch
+    : process.platform;
+
+const artifactName = "ninja-" + artifactPath;
+
+// Pass artifactPath and artifactName to subsequent GitHub actions
+console.log(`::set-output name=artifact_path::${artifactPath}`);
+console.log(`::set-output name=artifact_name::${artifactName}`);

createBinDir.js

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+// Create bin dir for CI
+
+const fs = require("fs");
+const path = require("path");
+
+const platform = process.platform;
+const arch = process.arch;
+
+const binDir = platform === "darwin" ? platform + arch : platform;
+const binPath = path.join(__dirname, "..", binDir);
+
+fs.mkdirSync(binPath);