Season the salmon fillet evenly with sea salt and black pepper.
Heat avocado oil in a non-stick skillet over medium-high heat until shimmering.
Place the salmon skin-side down in the pan and sear for 4-5 minutes until the skin is golden and very crispy.
Flip the salmon and cook for another 2-3 minutes until the center is just opaque, then remove from heat and flake into large pieces.
In a small bowl, gently fold the rice vinegar into the cooked sushi rice.
Lay the nori sheet on a bamboo rolling mat and spread the seasoned rice in a thin layer over the bottom two-thirds of the sheet.
Arrange the flaked salmon, edamame, avocado slices, and julienned cucumber in a horizontal line across the center of the rice.
Using the mat, roll the nori tightly away from you to form a firm cylinder, sealing the edge with a drop of water if needed.
Slice the roll into 8 even pieces using a very sharp, slightly damp knife.
Whisk the Greek yogurt and sriracha together in a small bowl and serve alongside the rolls for dipping.