Adding upstream version 5.2.3+dfsg.

Signed-off-by: Daniel Baumann <daniel@debian.org>

.github/workflows/browserstack.yml

@@ -0,0 +1,38 @@
+name: BrowserStack
+
+on:
+  push:
+  workflow_dispatch:
+
+env:
+  FORCE_COLOR: 2
+  NODE: 16
+
+jobs:
+  browserstack:
+    runs-on: ubuntu-latest
+    if: github.repository == 'twbs/bootstrap' && (!contains(github.event.commits[0].message, '[ci skip]') && !contains(github.event.commits[0].message, '[skip ci]'))
+    timeout-minutes: 30
+
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v3
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: "${{ env.NODE }}"
+          cache: npm
+
+      - name: Install npm dependencies
+        run: npm ci
+
+      - name: Run dist
+        run: npm run dist
+
+      - name: Run BrowserStack tests
+        run: npm run js-test-cloud
+        env:
+          BROWSER_STACK_ACCESS_KEY: "${{ secrets.BROWSER_STACK_ACCESS_KEY }}"
+          BROWSER_STACK_USERNAME: "${{ secrets.BROWSER_STACK_USERNAME }}"
+          GITHUB_SHA: "${{ github.sha }}"