I wrote an article on converting my Cosmos DB PowerShell module to use a CI process in Azure DevOps over on the awesome PowerShell Magazine. Check it out here.
The list of assemblies stored in the Global Assembly Cache (GAC) can be found in the registry under the HKEY_CLASSES_ROOT\Installer\Assemblies\Global key.
If you want to get a list of the assemblies registered in the GAC using PowerShell you can use this snippet:
The first line registers a new drive called HKCR in PowerShell that maps to the HKEY_CLASSES_ROOT in the registry. This is required because, by default only the HKEY_CURRENT_USER and HKEY_LOCAL_MACHINE registry hives are registered as drives in PowerShell.
The second line just gets the list of registry properties in the HKEY_CLASSES_ROOT\Installer\Assemblies\Global key and displays them.