FROM microsoft/aspnetcore-build:2.0 AS build-env
WORKDIR /app

# Copy csproj and restore as distinct layers
COPY *.csproj ./
RUN dotnet restore

# Copy everything else and build
COPY . ./
RUN dotnet publish -c Release -o out

# Build runtime image
FROM microsoft/aspnetcore:2.0
WORKDIR /app
COPY --from=build-env /app/out .
CMD ASPNETCORE_URLS=http://*:$PORT dotnet <YOUR_API_NAME>.dll

docker build -t aspnetapp <YOUR_API_NAME>
docker login --username=$HEROKU_USERNAME --password=$HEROKU_API_KEY registry.heroku.com
docker tag aspnetapp registry.heroku.com/$HEROKU_APP_NAME/web
docker push registry.heroku.com/$HEROKU_APP_NAME/web