completed first web iteration

Dockerfile

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+# syntax=docker/dockerfile:1.6
+
+###############################################
+# Build stage: compile Flutter web artifacts. #
+###############################################
+FROM ubuntu:22.04 AS build
+
+ENV DEBIAN_FRONTEND=noninteractive \
+    FLUTTER_CHANNEL=stable \
+    FLUTTER_VERSION=3.24.3 \
+    FLUTTER_HOME=/opt/flutter
+
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+        ca-certificates \
+        curl \
+        git \
+        unzip \
+        xz-utils \
+        zip \
+        libglu1-mesa && \
+    rm -rf /var/lib/apt/lists/*
+
+RUN curl -fsSL "https://storage.googleapis.com/flutter_infra_release/releases/${FLUTTER_CHANNEL}/linux/flutter_linux_${FLUTTER_VERSION}-${FLUTTER_CHANNEL}.tar.xz" \
+    | tar -xJ -C /opt && \
+    ln -s ${FLUTTER_HOME} /usr/local/flutter
+
+ENV PATH="${FLUTTER_HOME}/bin:${FLUTTER_HOME}/bin/cache/dart-sdk/bin:${PATH}"
+
+RUN flutter config --enable-web && \
+    flutter doctor -v
+
+WORKDIR /app
+
+COPY pubspec.yaml pubspec.lock ./
+RUN flutter pub get
+
+COPY . .
+RUN flutter build web --release
+
+##########################################
+# Runtime stage: serve assets via nginx. #
+##########################################
+FROM ubuntu:22.04 AS runner
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends nginx && \
+    rm -rf /var/lib/apt/lists/*
+
+# Remove default site definition to avoid duplicate configs.
+RUN rm -f /etc/nginx/sites-enabled/default
+
+# Provide a minimal nginx site config for the Flutter web assets.
+RUN printf 'server {\n\
+    listen 80 default_server;\n\
+    listen [::]:80 default_server;\n\
+    root /var/www/html;\n\
+    index index.html;\n\
+    location / {\n\
+        try_files $uri $uri/ /index.html;\n\
+    }\n\
+}\n' > /etc/nginx/conf.d/flutter.conf
+
+COPY --from=build /app/build/web /var/www/html
+
+EXPOSE 80
+
+CMD ["nginx", "-g", "daemon off;"]
+