In a small bowl, mix the salt, oregano, cumin, cinnamon, olive oil, pepper, liquid smoke (if using), and orange juice. Sprinkle over the country ribs and lightly rub the spices into the meat. If you have time, let the ribs rest for 30 minutes (or up to overnight in the refrigerator).
Add the garlic and lime juice to the inner pot. Place the ribs in the pot, arranging them in a single layer. Lock the lid into place. Select Manual or Pressure Cook; adjust the pressure to High and the time to 25 minutes.
While the pork is cooking, make the salsa. In a medium bowl, mix the pineapple, bell pepper, onion, pepper, cilantro, 1 teaspoon of lime juice, and salt. Taste and add the second teaspoon of lime juice if you want it more tart.
After cooking, let the pressure release naturally for 10 minutes, then quick release any remaining pressure.
Unlock the lid. Use tongs to remove the ribs to a plate or cutting board. Use forks or your hands to shred the meat into bite-sized chunks, discarding any fat or gristle. To serve, spoon 1/4 cup or so of pork onto a tortilla and top with a spoonful of salsa.