Thanks for the clear explanation, I understand.
I hope that this problem is resolved.
For now, I have confirmed that it works fine on Google Compute Engine(Linux VM) so I will use it.

I tried various ways, but it's still not working.
In the case of running it with docker on linux, Is the dockerfile like this?

FROM microsoft/aspnetcore:2.0
RUN apt-get update && \   
    apt-get install -y libfontconfig1
WORKDIR /app
COPY . /app
EXPOSE 8080
ENV ASPNETCORE_URLS=http://*:8080
ENTRYPOINT ["dotnet", "WebApp.dll"]

Hello,
I'm trying to publish the example asp.net core web application to Google App Engine.
It works fine on local iis but not on GAE.

added Dockerfile and app.yaml:

Dockerfile

FROM gcr.io/google-appengine/aspnetcore:2.0
COPY . /app
WORKDIR /app
EXPOSE 8080
ENV ASPNETCORE_URLS=http://*:8080
ENTRYPOINT ["dotnet", "WebApp.dll"]

app.yaml

runtime: custom
env: flex

installed jsreport.Binary.Linux package and changed Startup.cs:

public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc();
            services.AddJsReport(new LocalReporting().UseBinary(
                RuntimeInformation.IsOSPlatform(OSPlatform.Linux) ?
                jsreport.Binary.Linux.JsReportBinary.GetBinary() :
                jsreport.Binary.JsReportBinary.GetBinary())
                .AsUtility().Create());
        }

going to the report page throws this error:
jsreport.Local.JsReportBinaryException: Error rendering report: Error: An error occurred while trying to execute the command: at onCriticalError ([eval]:36106:25) at [eval]:36061:13 at tryCatcher ([eval]:9718:23) at Promise._settlePromiseFromHandler ([eval]:38241:31) at Promise._settlePromise ([eval]:38298:18) at Promise._settlePromise0 ([eval]:38343:10) at Promise._settlePromises ([eval]:38418:18) at Async._drainQueue ([eval]:4650:16) at Async._drainQueues ([eval]:4660:10) at Immediate.Async.drainQueues [as _onImmediate] ([eval]:4534:14) at processImmediate [as _immediateCallback] (timers.js:396:17) {"originalError":{}}(Original) Error: An error occurred while trying to start daemonized process: An error has occurred when trying to initialize jsreport.. seems like there is already a server running in port: 8080 at null.<anonymous> ([eval]:37276:13) at listener ([eval]:13761:10) at EventEmitter.emit ([eval]:13849:22) at onData ([eval]:85833:8) at Lazy.<anonymous> ([eval]:52268:13) at Lazy.<anonymous> ([eval]:52250:19) at emitTwo (events.js:87:13) at Lazy.emit (events.js:172:7) at Lazy.<anonymous> ([eval]:52251:22) at emitOne (events.js:77:13) at Lazy.emit (events.js:169:7) at yieldTo ([eval]:52358:18) at Function.<anonymous> ([eval]:52396:27) at Lazy.<anonymous> ([eval]:52364:21) at emitOne (events.js:77:13) at Lazy.emit (events.js:169:7) at Socket.<anonymous> ([eval]:52227:22) at emitNone (events.js:67:13) at Socket.emit (events.js:166:7) at emitReadable (_stream_readable.js:419:10) at emitReadable (_stream_readable.js:413:7) at readableAddChunk (_stream_readable.js:164:13) {}
at jsreport.Local.Internal.LocalUtilityReportingService.<RenderAsync>d__10.MoveNext

Please suggest me how to work it.
thanks.