Unable to install powershell module due to the authenticode signature of the file 'MicrosoftTeams.psd1' is not valid

Question

I'm having problems installing the Microsoft Teams module into a PowerShell container. From this docker hub site:
https://hub.docker.com/\_/microsoft-powershell

I'm using this Dockerfile:
https://github.com/PowerShell/PowerShell-Docker/blob/master/release/7-2/nanoserver1809/docker/Dockerfile

I built the cointainer with this command:
docker build . -f .\Docker\Docker.dockerfile -t provisioning-container:lts-7.2-nanoserver-1809

After building, the container launches and the PowerShell commandlets work. My ultimate goal is to launch the container with multiple modules installed, but I can't even get one to install manually, so I'm asking for help.

I've tried many iterations of this command, but none of them actually install anything:
(I've tried with and without all of the switches below. When I remove -force and include -SkipPublisherCheck it acts like it installs, but nothing actually happens)

PS C:\>
PS C:\> Install-Module -Name MicrosoftTeams -AllowClobber -Force -SkipPublisherCheck
Install-Package: C:\program files\powershell\Modules\PowerShellGet\PSModule.psm1:9685
Line |
9685 | … talledPackages = PackageManagement\Install-Package @PSBoundParameters
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| The module 'MicrosoftTeams' cannot be installed or updated because the authenticode signature of the file

'MicrosoftTeams.psd1' is not valid.

I saw some previous posts, but they don't fix my issue. In those posts, the experts wanted this info:
Get-Module -ListAvailable PowerShellGet

PS C:\>
PS C:\> Get-Module -ListAvailable PowerShellGet

Directory: C:\program files\powershell\Modules  

ModuleType Version PreRelease Name PSEdition ExportedCommands

---

Script 2.2.3 PowerShellGet Desk {Find-Command, Find-DSCResource, Find-Module, Find-> > > RoleCapability…}

PS C:\>
PS C:\> $psversiontable

Name Value

---

PSVersion 7.0.0
PSEdition Core
GitCommitId 7.0.0
OS Microsoft Windows 10.0.17763
Platform Win32NT
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
WSManStackVersion 3.0

PS C:\>
PS C:\> get-executionpolicy -list

    Scope ExecutionPolicy  
    ----- ---------------  

MachinePolicy Undefined
UserPolicy Undefined
Process Undefined
CurrentUser Undefined
LocalMachine RemoteSigned

PS C:\>

Answer 1

Is it possible the Dockerfile is building a container that doesn't have the proper certificates to authenticate the signed modules?

Answer 2

Apparently it's impossible to install any modules into nano server. It's been this way for years and I doubt they have it prioritized to fix.

https://github.com/PowerShell/PowerShell-Docker/wiki/Known-Issues

I went with this Dockerfile and everything just worked without issue.

Adding this immediately above "CMD ["pwsh.exe"] successfully built my image:

# install the Teams Module
RUN pwsh.exe -command "Install-Module -Name MicrosoftTeams -Force"
RUN pwsh.exe -command "Install-Module -Name AzureAD -Force"