upgrade build.yml to .NET 6

Author: mythz

.github/workflows/build.yml

@@ -11,13 +11,13 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: checkout
-        uses: actions/checkout@v2.0.0
+        uses: actions/checkout@v3.0.0
 
       - name: setup .net core
-        uses: actions/setup-dotnet@v1.7.2
+        uses: actions/setup-dotnet@v3
         with:
-          dotnet-version: 5.0.100
-
+          dotnet-version: '6.0'
+          
       - name: build
         run: dotnet build
         working-directory: ./src/Northwind/

src/Northwind/Dockerfile

@@ -1,4 +1,4 @@
-FROM mcr.microsoft.com/dotnet/aspnet:5.0 AS runtime
+FROM mcr.microsoft.com/dotnet/aspnet:6.0 AS runtime
 WORKDIR /app
 COPY publish/* ./
 RUN test -e ./Northwind.sqlite && mkdir -p App_Data && mv ./Northwind.sqlite ./App_Data/Northwind.sqlite