Azure DevOps Build pipline - azure

Question

I am new to AzureDevOps, i am trying to use Azure DevOps for one of my C++ project. My requirements are below.
1: Build C++ and publish to Artifactory(Azure),This i am able to do and binary able to publish in Artifactory.
2: I want to use that Artifactory(Binary file) while building Docker image with help of binary file. But i am unable to achieve in Azure DevOps. Locally i am able to build docker image with binary and running file.
Just As summary i am writing.
I need to create simple release pipeline using the build artifacts from the previous task
● The Release Pipeline should build a Docker image with the following requirements
○ must contain Build artifacts from the build pipeline.
Please find below code:
trigger:
- master
jobs:
- job: gcctest
pool:
vmImage: 'ubuntu-16.04'
steps:
- script: sudo apt-get update && sudo apt-get install libboost-all-dev
- script: g++ -std=c++11 -I/usr/include/boost/asio -I/usr/include/boost -o binary.out main.cpp
connection.cpp connection_manager.cpp mime_types.cpp reply.cpp request_handler.cpp request_parser.cpp server.cpp -lboost_system -lboost_thread -lpthread
- powershell:
$commitId= "$env:BUILD_SOURCEVERSION"
$definitionName= "$env:BUILD_DEFINITIONNAME"
$shortId= $commitId.Substring(1, 8)
$buildName="$definitionName.$shortId"
Write-Host $buildName
Write-Output "$buildName">readme.txt
# echo "##vso[task.setvariable variable=text]$buildName"
- task: CopyFiles#2
inputs:
sourceFolder: '$(Build.SourcesDirectory)'
contents: '?(*.out|*.txt)'
targetFolder: $(Build.ArtifactStagingDirectory)
- task: PublishBuildArtifacts#1
inputs:
pathToPublish: $(Build.ArtifactStagingDirectory)
artifactName: result
- task: Docker#1
displayName: 'Build using multi-stage'
inputs:
containerregistrytype: 'Container Registry'
dockerRegistryEndpoint: 'My Container Registry'
arguments: '--build-arg ARTIFACTS_ENDPOINT=$(ArtifactFeed)'
Docker File:
FROM ubuntu:18.04
RUN apt-get update
RUN apt-get install -y libboost-all-dev
COPY . /app
EXPOSE 80
CMD /app/binary.out 0.0.0.0 80 .```
~
Expected result:
Docker image should build by artifact and able to publish on DockerHub repo.