fix NUKE_CERT variables to be case insensitive

[marionbarker]

Purpose:

Make the ENABLE_NUKE_CERTS and FORCE_NUKE_CERTS variables case insensitive.

• When entering a variable on a computer, it is natural to type true
• On a phone, the default is to convert the first letter typed to a capital letter, causing True to be entered unless special care is taken

Several people have needed help to change their entries from True to true

Method

See LoopFollow PR 536 for method developed and tested that converts the NUKE_CERTS variable(s) to lower case.

[marionbarker]

Test

Push this branch to the docs-test GitHub LoopWorkspace repo to test.

Test 1

Set ENABLE_NUKE_CERTS to True, delete certs and confirm new certs are created with the appropriate message

• ✅ https://github.com/docs-test/LoopWorkspace/actions/runs/23553326182

Test 2

Set FORCE_NUKE_CERTS to TRUE and run create_certs.yml; confirm certs are revoked and new ones created

• ✅ https://github.com/docs-test/LoopWorkspace/actions/runs/23553463221