新增learn-kubernetes（https://github.com/yyong-brs/learn-kubernetes）相关文件

learn/learn-kubernetes-master/kiamol/ch05/docker-images/pi/Dockerfile

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+FROM mcr.microsoft.com/dotnet/sdk:6.0-alpine AS builder
+
+WORKDIR /src
+COPY src/Pi.Math/Pi.Math.csproj ./Pi.Math/
+COPY src/Pi.Runtime/Pi.Runtime.csproj ./Pi.Runtime/
+COPY src/Pi.Web/Pi.Web.csproj ./Pi.Web/
+
+WORKDIR /src/Pi.Web
+RUN dotnet restore
+
+COPY src/Pi.Math/ /src/Pi.Math/
+COPY src/Pi.Runtime /src/Pi.Runtime/
+COPY src/Pi.Web /src/Pi.Web/
+RUN dotnet publish -c Release -o /out Pi.Web.csproj
+
+# app image
+FROM mcr.microsoft.com/dotnet/aspnet:6.0-alpine 
+
+EXPOSE 80
+ENTRYPOINT ["dotnet", "Pi.Web.dll"]
+CMD ["-m", "console", "-dp", "6"]
+
+WORKDIR /app
+COPY --from=builder /out/ .