Caribbean Grilled Pork Tenderloin with Grilled Pineapple Salsa

Cooking spray

salt-free Caribbean jerk seasoning (such as McCormick)

kosher salt, divided

pork tenderloin, trimmed and halved crosswise

(1/2-inch-thick) slices fresh pineapple

diced red onion

chopped fresh cilantro

extra-virgin olive oil

fresh lime juice

Fresno chile, thinly sliced