AzureDevops build and deploy docker image with nuget package giving the error: error NU1301: Unable to load the service index for source

I am trying to build and push a docker image. This is giving me an error error NU1301: Unable to load the service index for source

The folder structure is as follows: src/appfolder/ In the appfolder I have the Dockerfile and nuget.config

The next two tasks I am trying to use are:

  - task: DockerInstaller@0
    inputs:
      dockerVersion: '17.09.0-ce'

  - task: Docker@2
    inputs:
      containerRegistry: '$(dockerRegistryServiceConnection)'
      repository: $(imageRepository)
      command: 'buildAndPush'
      Dockerfile: $(dockerfilePath)
      tags: 'latest'
      buildContext: '$(Build.SourcesDirectory)/src'

See Docker and nuget.config files

Docker:

FROM mcr.microsoft.com/dotnet/aspnet:8.0 AS base
WORKDIR /app
EXPOSE 80
EXPOSE 443


# This stage is used to build the service project
FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
ARG BUILD_CONFIGURATION=Release
WORKDIR /src
COPY . .
RUN dotnet restore "./appfolder/app.csproj"
WORKDIR "/src/appfolder"
RUN dotnet build "./app.csproj" -c $BUILD_CONFIGURATION -o /app/build

# This stage is used to publish the service project to be copied to the final stage
FROM build AS publish
ARG BUILD_CONFIGURATION=Release
RUN dotnet publish "./app.csproj" -c $BUILD_CONFIGURATION -o /app/publish /p:UseAppHost=false

# This stage is used in production or when running from VS in regular mode (Default when not using the Debug configuration)
FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "app.dll"]

nuget.config file

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <packageSources>
    <!--To inherit the global NuGet package sources remove the <clear/> line below -->
    <clear />
    <add key="Feed name" value="https://companyname.pkgs.visualstudio.com/project name/_packaging/feedname/nuget/v3/index.json" />
    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
  </packageSources>
  <packageSourceCredentials>
    <companyname>
      <add key="Username" value="my username" />
      <add key="ClearTextPassword" value="my own PAT" />
    </companyname>
  </packageSourceCredentials>
</configuration>

In the Feed Settings -> permissions tab I have both of the service users addded as a Feed publisher (contributor).

I tried a lot of options, but I started with the one I described here.

I can reproduce the same error when using your nuget.config file. In your nuget.config file, the key of your Azure Artifact package source is "Feed name" but your packageSourceCredentials is configured for another source named "companyname". To resolve the issue, modify your packageSourceCredentials as shown below.

  <packageSourceCredentials>
    <Feed name>
      <add key="Username" value="my username" />
      <add key="ClearTextPassword" value="my own PAT" />
    </Feed name>
  </packageSourceCredentials>

See the details about package source session in the nuget.config file from Package source sections.

Then, modify your Dockerfile from RUN dotnet restore "./appfolder/app.csproj" to RUN dotnet restore "./appfolder/app.csproj" --configfile "./appfolder/nuget.config". Also, add --no-restore to your dotnet build and dotnet publish command.