CI: migrate from Travis to GitHub Actions (split legacy/modern)

Author: eitanp461

.github/workflows/ci.yml

@@ -0,0 +1,60 @@
+name: CI
+
+on:
+  push:
+    branches: ["**"]
+  pull_request:
+    branches: ["**"]
+
+jobs:
+  test-legacy:
+    name: Legacy Node ${{ matrix.node }} • tests
+    strategy:
+      fail-fast: false
+      matrix:
+        node: ["9", "10"]
+    runs-on: ubuntu-latest
+    container:
+      image: node:${{ matrix.node }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Print Node & npm versions
+        run: |
+          node -v
+          npm -v
+
+      - name: Install dependencies
+        run: npm ci || npm i
+
+      - name: Run tests (Travis parity)
+        run: npm run test-with-temp-cloud
+
+  test-modern:
+    name: Node ${{ matrix.node }} • tests
+    strategy:
+      fail-fast: false
+      matrix:
+        node: ["12", "14", "16", "18", "20", "22"]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node }}
+          cache: npm
+
+      - name: Print Node & npm versions
+        run: |
+          node -v
+          npm -v
+
+      - name: Install dependencies
+        run: npm ci || npm i
+
+      - name: Run tests (Travis parity)
+        run: npm run test-with-temp-cloud