Possible to containerize a dotnet application with .net v2, .net v3 and .net 5 version for runtime?

Question

NOTE: I have no background in .NET applications however I have to wrap .NET already compiled application into a Docker Container.

I have a folder with .dll files and other specific Angular related files as well as many JSON files (and no .csproj files)

I began by using the following Dockerfile

FROM mcr.microsoft.com/dotnet/aspnet:5.0-focal-amd64
RUN apt-get update && \
      apt-get install -y --no-install-recommends curl \
            libgdiplus \
            libharfbuzz0b \
            libicu-dev \
            libfontconfig1 \
            libfreetype6 \
            libpango-1.0-0 \
            libpangocairo-1.0 && \
      apt-get autoremove -y && \
      apt-get purge -y --auto-remove && \
      rm -rf /var/lib/apt/lists/*

/root/.dotnet/corefx/cryptography/x509stores/my/
WORKDIR /App/DeployServer/
COPY DeployServer/* .


CMD ["dotnet", "/App/DeployServer/DeployServer.dll" ]

This is throwing the following error:

Error:
An assembly specified in the application dependencies manifest (DeployServer.deps.json) was not found:
    package: 'Microsoft.Data.SqlClient', version: '1.0.19249.1'
    path: 'runtimes/unix/lib/netcoreapp2.1/Microsoft.Data.SqlClient.dll'

I tried finding the above mentioned path within the DeployServer.deps.json file and it has the following content

"runtime": {
          "lib\/netcoreapp2.1\/Microsoft.Data.SqlClient.dll": {
            "assemblyVersion": "1.0.19249.1",
            "fileVersion": "1.0.19249.1"
          }
        },
        "runtimeTargets": {
          "runtimes\/unix\/lib\/netcoreapp2.1\/Microsoft.Data.SqlClient.dll": {
            "rid": "unix",
            "assetType": "runtime",
            "assemblyVersion": "1.0.19249.1",
            "fileVersion": "1.0.19249.1"
          },
          "runtimes\/win\/lib\/netcoreapp2.1\/Microsoft.Data.SqlClient.dll": {
            "rid": "win",
            "assetType": "runtime",
            "assemblyVersion": "1.0.19249.1",
            "fileVersion": "1.0.19249.1"
          }
        },
        "compile": {
          "ref\/netcoreapp2.1\/Microsoft.Data.SqlClient.dll": {}
        }

Assuming that the runtime requirements are needed for 2.1, I went ahead and changed the image to:

FROM mcr.microsoft.com/dotnet/aspnet:2.1

however, I stumble upon the following error

It was not possible to find any compatible framework version
The specified framework 'Microsoft.AspNetCore.App', version '5.0.0' was not found.
  - Check application dependencies and target a framework version installed at:
       /usr/share/dotnet/
  - Installing .NET Core prerequisites might help resolve this problem:
     https://go.microsoft.com/fwlink/?LinkID=798306&clcid=0x409
  - The .NET Core framework and SDK can be installed from:
      https://aka.ms/dotnet-download
  - The following versions are installed:
    2.1.30 at [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  - The specified framework 'Microsoft.AspNetCore.App', version '5.0.0' was not found.
  - Check application dependencies and target a framework version installed at:
    /usr/share/dotnet/
  - Installing .NET Core prerequisites might help resolve this problem:
     https://go.microsoft.com/fwlink/?LinkID=798306&clcid=0x409
 - The .NET Core framework and SDK can be installed from:
     https://aka.ms/dotnet-download
 - The following versions are installed:
    2.1.30 at [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]

It turns out in the DeployServer.deps.json there is mention of 2.1, 3.1.1, 5.0.0 and I am unable to understand how can I create a runtime which supports all the dependencies for different runtimes.