add Dockerfile

src/DevNews.WebApp/Dockerfile

@@ -0,0 +1,27 @@
+FROM mcr.microsoft.com/dotnet/aspnet:5.0 AS base
+WORKDIR /app
+EXPOSE 80
+
+FROM mcr.microsoft.com/dotnet/sdk:5.0.202 AS build
+WORKDIR /src
+COPY . .
+RUN dotnet tool restore
+ENV PATH="/root/.dotnet/tools:${PATH}"
+
+WORKDIR /src/src/DevNews.WebApp
+RUN dotnet paket restore
+RUN dotnet restore -nowarn:msb3202,nu1503
+RUN dotnet build -c Release -o /app
+
+FROM build as unittests
+WORKDIR /src/tests/DevNews.Core.UnitTests
+RUN dotnet restore -nowarn:msb3202,nu1503
+RUN dotnet run
+
+FROM build AS publish
+RUN dotnet publish --no-restore -c Release -o /app
+
+FROM base AS final
+WORKDIR /app
+COPY --from=publish /app .
+ENTRYPOINT ["dotnet", "DevNews.WebApp.dll" ]