Add docker build workflow

.github/workflows/docker-build.yml

@@ -0,0 +1,21 @@
+name: Build Docker with theme
+
+on:
+ pull_request:
+ branches: [ master ]
+
+jobs:
+ test:
+
+ runs-on: ubuntu-latest
+
+ steps:
+ - uses: actions/checkout@v4
+ - name: Set up Ruby
+ with:
+ ruby-version: '3.3'
+ uses: ruby/setup-ruby@v1
+ - name: Build with Docker
+ continue-on-error: true
+ run: |
+ cd assets && docker build .