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

learn/learn-kubernetes-master/kiamol/ch04/docker-images/todo-list/Dockerfile

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+FROM mcr.microsoft.com/dotnet/sdk:6.0-alpine AS builder
+
+WORKDIR /src
+COPY src/ToDoList.csproj .
+RUN dotnet restore
+
+COPY src/ .
+RUN dotnet publish -c Release -o /out ToDoList.csproj
+
+# app image
+FROM mcr.microsoft.com/dotnet/aspnet:6.0-alpine
+
+WORKDIR /app
+ENTRYPOINT ["dotnet", "ToDoList.dll"]
+
+# elevated for access to Sqlite db
+ENV DATA_DIRECTORY="/data"\
+    USER="root"
+
+ENV ConfigController__Enabled="false" \
+    ConnectionStrings__ToDoDb="Filename=/data/todo-list.db" \
+    Logging__LogLevel__Default="Error"
+
+VOLUME $DATA_DIRECTORY
+USER $USER
+
+COPY --from=builder /out/ .