Please check the code file reference here for Azure DevOps Release Pipeline!
Code:
Step 2: Power Platform Pack Solution
Source Folder of Solution to Pack:
$(System.DefaultWorkingDirectory)/_PowerPlatformSource/PowerPlatformApps/Unmanaged
Solution Output File:
$(Build.StagingDirectory)\$(SolutionName).zip
Step 3: Power Platform Import Solution
Solution Input File:
$(Build.StagingDirectory)\$(SolutionName).zip