fixed

Dockerfile.dev

@@ -1,11 +1,12 @@
-FROM mcr.microsoft.com/dotnet/sdk:5.0 as build-env
+FROM mcr.microsoft.com/dotnet/core/sdk:3.1 as build-env
 WORKDIR /source
+COPY Packages/. Packages/.
 COPY . .
-RUN dotnet restore --configfile nuget.config
+RUN dotnet restore -s /source/Packages -s https://api.nuget.org/v3/index.json
 RUN dotnet build
 RUN dotnet publish -o /publish --configuration Release;
 
-FROM mcr.microsoft.com/dotnet/sdk:5.0
+FROM mcr.microsoft.com/dotnet/aspnet:3.1
 COPY . .
 RUN DEBIAN_FRONTEND=noninteractive apt-get update && apt-get install -y --no-install-recommends apt-utils
 RUN DEBIAN_FRONTEND=noninteractive apt-get install -y fontconfig