Run nightly automated screenshots. Closes #2699

.github/workflows/screenshots.yml

@@ -0,0 +1,43 @@
+name: Take nightly screenshots
+
+on:
+  schedule:
+    - cron: '0 4 * * *'
+
+env:
+  BROWSERSTACK_KEY: ${{ secrets.BROWSERSTACK_KEY }}
+  BROWSERSTACK_PASSWORD: ${{ secrets.BROWSERSTACK_PASSWORD }}
+  BROWSERSTACK_USERNAME: ${{ secrets.BROWSERSTACK_USERNAME }}
+
+jobs:
+  Screenshots:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-go@v3
+        with:
+          go-version: '1.18.8'
+
+      - name: Automate screenshots
+        uses: nick-fields/retry@v2
+        with:
+          timeout_minutes: 10
+          max_attempts: 4
+          command: cd test/automated/screenshots && ./run.sh
+
+      - name: Commit changes
+        uses: EndBug/add-and-commit@v9
+        with:
+          author_name: Owncast
+          author_email: owncast@owncast.online
+          message: 'Commit screenshots'
+          pull: '--rebase --autostash'
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Dispatch event to web site
+        uses: peter-evans/repository-dispatch@v2
+        with:
+          token: ${{ secrets.BUNDLE_STORYBOOK_OWNCAST_ONLINE }}
+          repository: owncast/owncast.github.io
+          event-type: bundle-components-library