Impossible to get nuget package from another gitlab project (error NU1301)

I installed Gitlab locally. I have two projects: a toolkit (project 1) and a second project (project 2) which uses the nuget package from this first project. The nuget package is stored in Gitlab's package registry of project 1.

I want to create a docker image of project 2 and store it in the Gitlab container registry of project 2.

My gitlab-ci.yml file is as follows:

stages:  - deploydeploy-solution:  stage: deploy  image: docker:20.10.16  services:    - docker:20.10.16-dind  before_script:    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY  script:    - docker build --pull -t $CI_REGISTRY_IMAGE --build-arg TOKEN=$CI_JOB_TOKEN --no-cache .    - docker push $CI_REGISTRY_IMAGE  only:    - main

My nuget.config file is as follows:

<?xml version="1.0" encoding="utf-8"?><configuration><packageSources><clear /><add key="gitlab" value="https://<localdomain>/api/v4/projects/<project1_id>/packages/nuget/index.json" /><add key="nuget" value="https://api.nuget.org/v3/index.json" /></packageSources><packageSourceCredentials><gitlab><add key="Username" value="gitlab-ci-token" /><add key="ClearTextPassword" value="$TOKEN_ENV" /></gitlab></packageSourceCredentials></configuration>

My Dockerfile is as follows:

FROM mcr.microsoft.com/dotnet/aspnet:6.0 AS baseWORKDIR /appEXPOSE 80EXPOSE 443# BuildFROM mcr.microsoft.com/dotnet/sdk:6.0 AS build## Certificates SSLWORKDIR /usr/local/share/ca-certificates/COPY ["ca.crt", "."]RUN update-ca-certificates -f## Copy sources and buildWORKDIR /srcCOPY ["nuget.config", "."]ARG TOKENENV TOKEN_ENV=$TOKEN#RUN sed -i "s/PASSWORD/$TOKEN_ENV/" nuget.config <-- By replacing a keyword in the nuget.config fileCOPY ["Project2.API/Project2.API.csproj", "Project2.API/"]RUN dotnet restore "Project2.API/Project2.API.csproj"COPY . .WORKDIR "/src/Project2.API"RUN dotnet build "Project2.API.csproj" -c Release -o /app/build# PublishFROM build AS publishRUN dotnet publish "Project2.API.csproj" -c Release -o /app/publish /p:UseAppHost=false# DeployFROM base AS finalWORKDIR /appCOPY --from=publish /app/publish .ENTRYPOINT ["dotnet", "Project2.API.dll"]

The command in the gitlab-ci.yml file docker build --pull -t $CI_REGISTRY_IMAGE --build-arg TOKEN=$CI_JOB_TOKEN --no-cache . passes the token $CI_JOB_TOKEN as argument. This is retrieved in the Dockerfile and stored in an environment variable. This environment variable is used in the nuget.config file as $TOKEN_ENV.

When the restoring of the nuget package of project 1 is carried out with the command RUN dotnet restore "Project2.API/Project2.API.csproj", the following error is displayed:

error NU1301: Unable to load the service index for source https://<localdomain>/api/v4/projects/<project1_id>/packages/nuget/index.json. [/src/Project2.API/Project2.API.csproj]

I also tried to replace a keyword by the token in the nuget.config file with the command RUN sed -i "s/PASSWORD/$TOKEN_ENV/" nuget.config (see the line commented in the Dockerfileabove) after copying thenuget.config` file and after filling the environment variable with the token.

<add key="ClearTextPassword" value="PASSWORD" />

A reading of the file shows the keyword is replaced by [MASKED] and not by the token. So, I still get the same error.

Note that the project 2 has a token access to project 1 with a Gitlab's configuration in the project 1 (Project 1 > Settings > CI/CD > Access token).

How to fix the error ?