You can do that with a custom JavaScript. This article explain how to inclement your own JavaScript:
https://technet.microsoft.com/en-us/library/dn636121.aspx
If you want user to automatically sign-in to WorkDay, you can also craft a link such as:
https://ADFS_FQDN/adfs/ls/IdpInitiatedSignOn.aspx?loginToRP=ID_OF_YOUR_RPT
Replace ADFQ_FQDN with the actual FQDN of your farm and the ID_OF_YOUR_RPT with the Identifier of the RPT trust (not its name but its identifier).
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