Add multi-stage Dockerfile (backend + client tarball)

.dockerignore

@@ -0,0 +1,13 @@
+**/bin
+**/obj
+**/.vs
+.git
+.gitignore
+.vscode
+.idea
+docs
+tests
+backend.tests
+*.md
+.dockerignore
+Dockerfile

Dockerfile

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+# syntax=docker/dockerfile:1.7
+
+# ---- Backend build ----
+FROM mcr.microsoft.com/dotnet/sdk:9.0 AS build
+WORKDIR /src
+COPY Assistant.sln ./
+COPY backend/backend.csproj backend/
+COPY backend.tests/backend.tests.csproj backend.tests/
+RUN dotnet restore backend/backend.csproj
+COPY backend/ backend/
+RUN dotnet publish backend/backend.csproj -c Release -o /publish
+
+# ---- Client bundle ----
+FROM alpine:3.20 AS bundle
+WORKDIR /src
+RUN apk add --no-cache tar gzip
+COPY client/ client/
+COPY requirements.txt requirements-nodeps.txt ./
+RUN tar czf /client.tar.gz client/ requirements.txt requirements-nodeps.txt
+
+# ---- Final ----
+FROM mcr.microsoft.com/dotnet/aspnet:9.0
+WORKDIR /app
+COPY --from=build /publish/ ./
+RUN mkdir -p ./wwwroot && mkdir -p /data /keys
+COPY --from=bundle /client.tar.gz ./wwwroot/client.tar.gz
+
+ENV ASPNETCORE_URLS=http://+:8080
+ENV ConnectionStrings__Default="Data Source=/data/assistant.db"
+ENV Install__ClientTarballPath="/app/wwwroot/client.tar.gz"
+EXPOSE 8080
+ENTRYPOINT ["dotnet", "backend.dll"]