Initial Rails test app

Dockerfile

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+FROM ruby:3.2-slim
+
+RUN apt-get update -qq && \
+    apt-get install -y build-essential libmariadb-dev git curl && \
+    rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY Gemfile Gemfile.lock ./
+RUN bundle install
+
+COPY . .
+
+RUN bundle exec rails assets:precompile 2>/dev/null || true
+
+EXPOSE 3000
+
+CMD ["bundle", "exec", "puma", "-C", "config/puma.rb"]