fixup! Add GitHub CI workflows

Author: amezin

.github/workflows/ci.yml

@@ -11,39 +11,78 @@ jobs:
   lint:
     runs-on: ubuntu-slim
     timeout-minutes: 5
+
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
+        with:
+          node-version: lts/*
+
       - run: npm ci
       - run: npm run lint
 
-  dist-check:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version: [20.x, 22.x, 24.x]
+
     runs-on: ubuntu-slim
     timeout-minutes: 5
+
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
+        with:
+          node-version: ${{ matrix.node-version }}
+
       - run: npm ci
       - run: npm run build
       - run: git diff --color --exit-code
 
   test-node:
-    runs-on: ubuntu-24.04
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version: [20.x, 22.x, 24.x]
+
+    runs-on: ubuntu-slim
     timeout-minutes: 10
+
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
+        with:
+          node-version: ${{ matrix.node-version }}
+
       - run: npm ci
       - run: npm run test:parallel
 
+  test-firefox:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+
+    steps:
+    - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+    - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
+      with:
+        node-version: lts/*
+
+    - run: npm ci
+    - run: xvfb-run -- npm run ci
+
   test-safari:
     runs-on: macos-latest
     timeout-minutes: 10
 
     steps:
     - run: osascript -e 'get version of application "Safari"'
+
     - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
     - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
+      with:
+        node-version: lts/*
+
     - run: npm ci
     - run: npm run ci
       env:
@@ -52,6 +91,7 @@ jobs:
   test-gjs:
     runs-on: ubuntu-24.04
     timeout-minutes: 10
+
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - run: sudo apt-get update