Fix

src/DynDNSv2/DynDNSv2.csproj

@@ -6,6 +6,7 @@
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>
+	<!--<ContainerFamily>alpine</ContainerFamily>-->
     <UserSecretsId>abe55787-bc11-416d-85aa-eaf544f21fe1</UserSecretsId>
   </PropertyGroup>
 

src/DynDNSv2/MultiBuild.Dockerfile

@@ -0,0 +1,21 @@
+# Learn about building .NET container images:
+# https://github.com/dotnet/dotnet-docker/blob/main/samples/README.md
+FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/sdk:8.0-alpine AS build
+ARG TARGETARCH
+WORKDIR /source
+
+# copy csproj and restore as distinct layers
+COPY ./DynDNSv2/DynDNSv2.csproj .
+RUN dotnet restore -a $TARGETARCH
+
+# copy and publish app and libraries
+COPY ./DynDNSv2/. .
+RUN dotnet publish --no-restore -a $TARGETARCH -o /app
+
+# Enable globalization and time zones:
+# https://github.com/dotnet/dotnet-docker/blob/main/samples/enable-globalization.md
+# final stage/image
+FROM mcr.microsoft.com/dotnet/aspnet:8.0-alpine
+WORKDIR /app
+COPY --from=build /app .
+ENTRYPOINT ["./DynDNSv2"]