Create Dockerfile.

Dockerfile

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+# Stage 1: Base runtime
+FROM mcr.microsoft.com/dotnet/aspnet:9.0 AS base
+WORKDIR /app
+EXPOSE 8080
+
+# Stage 2: Build
+FROM mcr.microsoft.com/dotnet/sdk:9.0 AS build
+WORKDIR /src
+
+# Copy the solution file
+COPY ["ImperialRecruitment.sln", "./"]
+
+# Copy all project files (so restore works with project references)
+COPY ["IR.Blazor/IR.Blazor.csproj", "IR.Blazor/"]
+COPY ["IR.Data/IR.Data.csproj", "IR.Data/"]
+COPY ["IR.Domain/IR.Domain.csproj", "IR.Domain/"]
+
+# Restore packages
+RUN dotnet restore "./ImperialRecruitment.sln"
+
+# Copy the rest of the source
+COPY . .
+
+# Publish only the Blazor Server project
+WORKDIR "/src/IR.Blazor"
+RUN dotnet publish -c Release -o /app/publish
+
+# Stage 3: Runtime container
+FROM base AS final
+WORKDIR /app
+COPY --from=build /app/publish .
+ENTRYPOINT ["dotnet", "IR.Blazor.dll"]