Dockerfile-3

FROM mcr.microsoft.com/dotnet/core/sdk:2.2-alpine as build
WORKDIR /app

COPY *.csproj .
RUN dotnet restore -r linux-musl-x64

FROM build as publish
WORKDIR /app
COPY . .
#add IL linker package
RUN dotnet add package ILLink.Tasks -v 0.1.5-preview-1841731 -s https://dotnet.myget.org/F/dotnet-core/api/v3/index.json
RUN dotnet publish -c Release -r linux-musl-x64 -o out --no-restore /p:ShowLinkerSizeComparison=true

FROM mcr.microsoft.com/dotnet/core/runtime-deps:2.2-alpine as runtime
WORKDIR /app
EXPOSE 80
COPY --from=publish /app/out ./
ENTRYPOINT ["./demoapp"]