Add Docker configuration and initial server setup for bus_running_record app

Dockerfile

@@ -0,0 +1,22 @@
+# Build stage
+FROM cirrusci/flutter:latest AS builder
+
+WORKDIR /app
+COPY pubspec.* ./
+COPY lib ./lib
+COPY web ./web
+COPY assets ./assets
+
+RUN flutter pub get
+RUN flutter build web --release
+
+# Serve stage
+FROM nginx:alpine
+
+COPY --from=builder /app/build/web /usr/share/nginx/html
+
+COPY nginx.conf /etc/nginx/nginx.conf
+
+EXPOSE 80
+
+CMD ["nginx", "-g", "daemon off;"]