Hi @ramki1979,
If you don’t need the unsigned APK at all, then you can simply change the APK filter of the Gradle Runner step to not to include (exclude filters input) the unsigned APK - see: File already exists error
If you do need both to be attached to the build / deployed, but you only want a public install page for the signed on: please use two separate Deploy to Bitrise.io steps, one for the unsigned APK and one for the signed one. Related #how-to : How to deploy only a specific Android APK? (Use multiple deploy steps and set specific path(s) section). This discussion might also help, in case you’d need the public install page of both: Public install page URLs for multiple apps
If you have any questions just let us know! 