feat: rework to use next and host from single dockerfile

docker/Dockerfile

@@ -0,0 +1,45 @@
+# Stage 1: Build the Next.js frontend
+FROM docker.io/library/node:24-alpine AS frontend-builder
+LABEL authors="lucasoskorep"
+
+WORKDIR /build/mta-sign-ui
+
+# Enable corepack for pnpm
+RUN corepack enable && corepack prepare pnpm@10.28.1 --activate
+
+# Copy package files first for better caching
+COPY mta-sign-ui/package.json mta-sign-ui/pnpm-lock.yaml* ./
+
+# Install dependencies (use frozen-lockfile if lock exists, otherwise generate)
+RUN pnpm install
+
+# Copy the rest of the frontend source
+COPY mta-sign-ui/ ./
+
+# Build the static export (outputs to 'out' directory)
+RUN pnpm build
+
+# Stage 2: Python backend with frontend static files
+FROM ghcr.io/astral-sh/uv:python3.13-bookworm
+LABEL authors="lucasoskorep"
+
+WORKDIR /app
+
+# Copy dependency files and install dependencies only (not the project itself)
+COPY pyproject.toml uv.lock README.md ./
+RUN uv sync --frozen --no-dev --no-install-project
+
+# Copy source code
+COPY mta_api_client ./mta_api_client
+COPY mta_sign_server ./mta_sign_server
+COPY main.py stops.txt ./
+
+# Copy the built frontend from the first stage
+COPY --from=frontend-builder /build/mta-sign-ui/out ./static
+
+# Now install the project
+RUN uv sync --frozen --no-dev
+
+EXPOSE 8000
+
+ENTRYPOINT ["uv", "run", "python", "main.py"]