Revert "fix docker builds"

Dockerfile

@@ -1,5 +1,5 @@
 # https://hub.docker.com/_/microsoft-dotnet-core
-FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
+FROM mcr.microsoft.com/dotnet/core/sdk:3.1-alpine AS build
 WORKDIR /source
 
 # copy csproj and restore as distinct layers
@@ -14,7 +14,7 @@ WORKDIR /source
 RUN dotnet publish -c release -o /app --no-restore
 
 # final stage/image
-FROM mcr.microsoft.com/dotnet/runtime:6.0
+FROM mcr.microsoft.com/dotnet/core/runtime:3.1-alpine	
 WORKDIR /app
 COPY --from=build /app ./
 ENTRYPOINT ["dotnet", "StoreBot.dll"]