Re-implemented the ability to "Bust Cache" in cirlceci 2.1 workflows

I don’t know where else to put this, but my team had a very specific reason for needing Cache Busting which was removed from CircleCI 2.X.

Make a Runtime Parameter openmct/config.yml at 86e5d10fc172e5a3c9627df5371cd632651470ea · nasa/openmct · GitHub

Make a custom restore cache command which is skipped if parameter = false

May seem straightforward, but I just wanted to share. Thanks!