From the secret page, click "Add Secret to Workload". The radio button for environment has a typo.
*** Bug 1803842 has been marked as a duplicate of this bug. ***
Now is “Environment Variables”
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.