Toss the pork cubes with chili powder, oregano, cumin, coriander, and salt. Set Instant Pot to Saute on High, add oil, and brown cubes on all sides for 5 minutes. Turn Instant Pot off. Whisk together orange juice, lime juice, beer or broth, bay leaf, and garlic. Pour over pork and stir bottom with a wooden spoon to scrape up any brown bits. Set Instant Pot to High Pressure for 30 minutes. Cook and let steam release naturally for 10-15 minutes. Open lid carefully, remove bay leaf, use a slotted spoon to remove pork to a large bowl. Use two forks to shred pork, and add 1-2 cups of liquid or more as desired.