gitlab runner shell executer path finding problems - docker

Question

I'm kinda stuck in how to deploy something.
As a dotnet developer I created a webapp (just the simple weatherforecastteamplte) and tried to deploy this.
My ci-cd has 3 stages: build, test and deploy.
My first approach was to use aa ssh key to ssh into my buildserver and transfer the files, because I had gitlab runner running on my gitlab server rather than my buildserver.
For security reasons and other reasons , I have installed gitlab-runner on my buildserver.
My buildserver includes all the tools I nedd: docker, docker-compose, dotnet-npm, ...
So i registered a new runner with shell.
It starts to build the image but when it comes in my dokcerfile it gets stuck because it can't find the cproj file. Currently I have been trying to figure out where the executer is looking for the project file but currently I can't figure it out.
Hope someone can help me.
my dockerfile (generated by visual studio':
#See https://aka.ms/containerfastmode to understand how Visual Studio uses this Dockerfile to build your images for faster debugging.
FROM mcr.microsoft.com/dotnet/aspnet:6.0 AS base
WORKDIR /app
EXPOSE 80
EXPOSE 443
FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
WORKDIR /src
COPY ["Test/Test.csproj", "Test/"]
RUN dotnet restore "Test/Test.csproj"
COPY . .
WORKDIR "/src/Test"
RUN dotnet build "Test.csproj" -c Release -o /app/build
FROM build AS publish
RUN dotnet publish "Test.csproj" -c Release -o /app/publish
FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "Test.dll"]
my gitlab ci cd file:
image: mcr.microsoft.com/dotnet/sdk:latest
stages:
- build
- test
- deploy
before_script:
- dotnet restore Test.sln
build:
stage: build
tags:
- dev
script:
- 'dotnet build --no-restore Test.sln'
tests:
stage: test
tags:
- dev
script:
- 'dotnet test --no-restore Test.sln'
deploy:
stage: deploy
environment: production
tags:
- dev
before_script:
- cd Test
script:
- 'docker build - < Dockerfile'