build(docker): add container setup with persistent ./data volume

Add a multi-stage Dockerfile (Vue build + .NET 10 publish) and a docker-compose service exposing port 8080 with a single bind mount ./data -> /app/data for SurrealDB persistence. Include an example compose file, a .dockerignore, and document Docker usage and version 0.0.1 in the README.

Dockerfile

@@ -0,0 +1,46 @@
+# syntax=docker/dockerfile:1
+
+# --- Stage 1: build klienta (Vue 3 + Vite) ---
+FROM node:22-alpine AS client
+WORKDIR /src/client
+COPY client/package.json client/package-lock.json ./
+RUN npm ci
+COPY client/ ./
+RUN npm run build
+
+# --- Stage 2: build i publish backendu (ASP.NET Core, .NET 10) ---
+FROM mcr.microsoft.com/dotnet/sdk:10.0 AS build
+WORKDIR /src
+COPY backend/TarninaHub.csproj ./backend/
+RUN dotnet restore ./backend/TarninaHub.csproj
+COPY backend/ ./backend/
+COPY --from=client /src/client/dist ./backend/wwwroot/
+RUN dotnet publish ./backend/TarninaHub.csproj \
+    --configuration Release \
+    --output /app/publish \
+    /p:UseAppHost=false
+
+# --- Stage 3: runtime ---
+FROM mcr.microsoft.com/dotnet/aspnet:10.0 AS runtime
+WORKDIR /app
+
+ARG APP_VERSION=0.0.1
+LABEL org.opencontainers.image.title="TarninaHub" \
+      org.opencontainers.image.version="${APP_VERSION}"
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends curl \
+    && rm -rf /var/lib/apt/lists/*
+
+ENV ASPNETCORE_ENVIRONMENT=Production \
+    ASPNETCORE_URLS=http://+:8080 \
+    DOTNET_EnableDiagnostics=0
+
+COPY --from=build /app/publish ./
+
+# Jedyny wolumen aplikacji: trwałe dane SurrealDB (embedded RocksDB).
+RUN mkdir -p /app/data
+VOLUME ["/app/data"]
+
+EXPOSE 8080
+ENTRYPOINT ["dotnet", "TarninaHub.dll"]