add .github files

.github/dependabot.yml

@@ -0,0 +1,18 @@
+version: 2
+updates:
+  - package-ecosystem: 'npm'
+    directory: '/'
+    schedule:
+      interval: 'weekly'
+    groups:
+      angular:
+        applies-to: version-updates
+        patterns:
+          - '@angular*'
+        update-types:
+          - 'minor'
+          - 'patch'
+  - package-ecosystem: 'github-actions'
+    directory: '/'
+    schedule:
+      interval: 'weekly'

.github/workflows/check-webui-build.yml

@@ -0,0 +1,23 @@
+name: Check @showbridge/webui builds
+on:
+  pull_request:
+    branches:
+      - main
+jobs:
+  build-webui:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
+
+      - name: Set up Node.js
+        uses: actions/setup-node@2028fbc5c25fe9cf00d9f06a71cc4710d4507903 # v6.0.0
+        with:
+          node-version-file: '.nvmrc'
+          cache: 'npm'
+          cache-dependency-path: 'package-lock.json'
+
+      - name: Install Node.js dependencies
+        run: npm ci
+
+      - run: npm run build