The only thing special about the brig (outside of crisis/skill checks) is that you can't MOVE away from it.
So, your available actions are the same as always: activate the location you're at or play a card with "Action" on it.
I think in general the actions available to a player are:
*Play a card with Action: on it. (these cards are: Consolidate Power, Executive Order, State of Emergency, Launch Scout, Scout for Fuel, Maximum Firepower, Repair, and Build Nuke...also Quorum cards would fit here).
*Use an Action on a Title Card. CAG can activate unmanned Viper, President can draw a quorum card, Admiral can launch a nuke.
*Activate the location you are at.
(For you as Boomer:
-Max Firepower and Repair will never be useful in the Brig, Consolidate Power, Executive Order, and State of Emergency are not available to Boomer, so you're highly limited there.
-You don't have a title card
-the location you are at is the brig, and activating the brig = making an escape attempt)