title: AzureDevops can't find csproj file when build Dockerfile
body: <p>I'm trying to create a pipeline in AzureDevops, so I have the following <strong>Dockerfile</strong>:</p>
  
  <pre><code>FROM mcr.microsoft.com/dotnet/core/aspnet:2.1-stretch-slim AS base
  WORKDIR /app
  EXPOSE 80
  EXPOSE 443
  
  FROM mcr.microsoft.com/dotnet/core/sdk:2.1-stretch AS build
  WORKDIR /src
  COPY ["WebApi/WebApi.csproj", "WebApi/"]
  RUN dotnet restore "WebApi/WebApi.csproj"
  COPY . .
  WORKDIR "/src/WebApi"
  RUN dotnet build "WebApi.csproj" -c Release -o /app/build
  
  FROM build AS publish
  RUN dotnet publish "WebApi.csproj" -c Release -o /app/publish
  
  FROM base AS final
  WORKDIR /app
  COPY --from=publish /app/publish .
  ENTRYPOINT ["dotnet", "WebApi.dll"]
  </code></pre>
  
  <p>When I try to run my pipeline I got the following error:</p>
  
  <pre><code>Step 7/17 : COPY ["WebApi/WebApi.csproj", "WebApi/"]
  COPY failed: stat /var/lib/docker/tmp/docker-builder651276881/WebApi/WebApi.csproj: no such file or directory
  ##[error]COPY failed: stat /var/lib/docker/tmp/docker-builder651276881/WebApi/WebApi.csproj: no such file or directory
  ##[error]/usr/bin/docker failed with return code: 1
  </code></pre>
  
  <p>I noted that AzureDevops build my Docker outsite the folder, with this command:</p>
  
  <pre><code>/usr/bin/docker build -f /home/vsts/work/1/s/WebApi/Dockerfile -t repository:9 /home/vsts/work/1/s/WebApi
  </code></pre>
  
  <p>I think I need enter in WebApi/ folder to execute the Build, because my Dockerfile try to copy the files.</p>