I would research the wiring schematics and splice them into the interior lights so they go on and off and fade when you open or close your doors (and for use with interior light switch). That would be the most practical way, and would look factory.
I've seen other threads on here talking about which wires you would need to use, and where to find them.
2014 Ram 1500 4x4 Crew Cab Big Horn (3.21 gears) - Black Ext. Black/Grey Int. Mods include: Weathertech Digital Floormats, Limo Tint + Windshield, 2.5" HBS Leveling Kit, Blacked out badges, LED bulbs Interior/Exterior, 13" Stubby AntennaX, In-Cab Air Filter Mod, 18" Ultra Baron Wheels & 275/70R18 Nitto Trail Grapplers.