Embed static resources (#1466)

* Replace pkger with go:embed for bundling the admin. Closes #844

* Remove references to pkged.go

* Point tests to use an updated version of Go

* Add comment to new exported function

* Cleanup

* Add a dummy pkged.go to alert people to stop using it.

* Add simple browser test to make sure the admin is available and renders

* Don't panic

* Embed bot/scraper metadata template.

Add browser test to validate the rendering of this template.

* Use embedded offline.ts segment

* Remove placeholder thumbnail as its unnecessary

* Remove copying the static directory into the release

* Cleanup

test/automated/browser/bot-share-search-scrapers.test.js

@@ -0,0 +1,48 @@
+const listenForErrors = require('./lib/errors.js').listenForErrors;
+
+describe('Video embed page', () => {
+  
+  async function getMetaTagContent(property) {
+    const selector = `meta[property="${property}"]`;
+
+    const tag = await page.evaluate((selector) => {
+      return document.head.querySelector(selector).getAttribute("content");
+    }, selector);
+    return tag;
+  }
+
+  beforeAll(async () => {
+    await page.setViewport({ width: 1080, height: 720 });
+    listenForErrors(browser, page);
+    page.setUserAgent(
+      "Mastodon"
+    );
+    await page.goto('http://localhost:5309');
+  });
+
+  afterAll(async () => {
+    await page.waitForTimeout(3000);
+    await page.screenshot({ path: 'screenshots/screenshot_bots_share_search_scrapers.png', fullPage: true });
+  });
+
+  it('should have rendered the simple bot accessible html page', async () => {
+    await page.waitForSelector('h1');
+    await page.waitForSelector('h3');
+
+    const ogVideo = await getMetaTagContent('og:video');
+    expect(ogVideo).toBe('http://localhost:5309/hls/stream.m3u8');
+
+    const ogVideoType = await getMetaTagContent('og:video:type');
+    expect(ogVideoType).toBe('application/x-mpegURL');
+
+    // When stream is live the thumbnail is provided as the image.
+    const ogImage = await getMetaTagContent('og:image');
+    expect(ogImage).toBe('http://localhost:5309/thumbnail.jpg');
+
+    const twitterUrl = await getMetaTagContent('twitter:url');
+    expect(twitterUrl).toBe('http://localhost:5309/');
+
+    const twitterImage = await getMetaTagContent('twitter:image');
+    expect(twitterImage).toBe('http://localhost:5309/logo/external');
+  });
+});