Add Deno tests and CI

.github/workflows/deno.yml

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+name: Deno CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test-deno:
+    needs: build
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        deno: [v1.10.3]
+        node-version: 16.x
+        build-how: ["cdn"]
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: Install Deno ${{ matrix.deno }}
+        run:
+          curl -fsSL https://deno.land/x/install/install.sh | sudo
+          DENO_INSTALL=/usr/local sh -s ${{ matrix.deno }}
+      - run: npm install
+      - run: node ./tools/build.js -t ${{ matrix.build-how }}
+      - name: Run tests
+        run: deno test test/deno/index.ts

test/deno/index.ts

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+import { assertStrictEquals } from "https://deno.land/std@0.97.0/testing/asserts.ts";
+
+import hljs from "../../build/es/core.js";
+import js from "../../build/es/languages/javascript.min.js";
+
+hljs.registerLanguage("javascript", js);
+
+Deno.test({
+  name: "should return relevance key",
+  async fn() {
+    const out = hljs.highlight("", { language: "javascript" });
+    assertStrictEquals(out.relevance, 0);
+  },
+});
+
+Deno.test({
+  name: "should highlight block",
+  async fn() {
+    const code = 'var say = "Hello";';
+    const expected =
+      '<span class="hljs-keyword">' +
+      'var</span> say = <span class="hljs-string">' +
+      '&quot;Hello&quot;</span>;';
+
+    const out = hljs.highlight(code, { language: "javascript" });
+    assertStrictEquals(out.value, expected);
+  },
+});