Switch ci to github actions (Strilanc#459)

- Use puppeteer to run unit tests

.github/workflows/ci.yml

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+name: ci
+on: [push]
+jobs:
+  build-and-run-unit-tests:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-node@v1
+      with:
+        node-version: 12.x
+    - run: npm install
+    - run: grunt build-test-page
+    - run: node PuppeteerRunTests.js
+  screenshot-circuit:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-node@v1
+      with:
+        node-version: 12.x
+    - run: npm install
+    - run: npm run build
+    - run: node PuppeteerScreenshotCircuit.js
+    - uses: actions/upload-artifact@v2
+      with:
+        name: screenshot
+        path: screenshot.png

PuppeteerRunTests.js

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+const puppeteer = require('puppeteer');
+
+(async () => {
+    try {
+        const browser = await puppeteer.launch();
+        const page = await browser.newPage();
+        let caughtPageError = false;
+        page.on('console', message => console.log(message.text()));
+        page.on('pageerror', ({message}) => {
+            caughtPageError = true;
+            console.error("Page error bubbled into PuppeteerRunTests.js: " + message);
+        });
+
+        const outDirUrl = 'file:///' + __dirname.split('\\').join('/') + '/out/';
+        await page.goto(outDirUrl + 'test.html#blocking');
+        await page.waitForSelector('#done', {timeout: 5 * 60 * 1000});
+        let anyFailures = await page.evaluate('__any_failures');
+
+        await browser.close();
+        if (anyFailures || caughtPageError) {
+            process.exit(1);
+        }
+    } catch (ex) {
+        console.error("Error bubbled up into PuppeteerRunTests.js: " + ex);
+        process.exit(1);
+    }
+})();

PuppeteerScreenshotCircuit.js

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+const puppeteer = require('puppeteer');
+
+(async () => {
+    try {
+        const browser = await puppeteer.launch();
+        const page = await browser.newPage();
+        let caughtPageError = false;
+        page.on('console', message => console.log(message.text()));
+        page.on('pageerror', ({message}) => {
+            caughtPageError = true;
+            console.error("Page error bubbled into PuppeteerSampleCircuit.js: " + message);
+        });
+        const outDirUrl = 'file:///' + __dirname.split('\\').join('/') + '/out/';
+        const circuitJson = '{"cols":[["H"],["Bloch"],["Amps1"],[],["Density"],["•","X"],["Chance2"]]}';
+        await page.goto(outDirUrl + 'quirk.html#circuit=' + circuitJson);
+        await page.waitForSelector('#loading-div', {visible: false, timeout: 5 * 1000});
+        await page.screenshot({path: 'screenshot.png'});
+        await browser.close();
+    } catch (ex) {
+        console.error("Error bubbled up into PuppeteerSampleCircuit.js: " + ex);
+        process.exit(1);
+    }
+})();