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Douglas Harper's Etymology Dictionary
techno-

word-forming element meaning "art, craft, skill," later "technical, technology," from Latinized form of Greek tekhno-, combining form of tekhne "art, skill, craft in work; method, system, an art, a system or method of making or doing," from PIE *teks-na- "craft" (of weaving or fabricating), from suffixed form of root *teks- "to weave, fabricate, make" (cognates: Sanskrit taksan "carpenter," Greek tekton "carpenter," Latin texere "to weave;" see texture (n.)).

Wiktionary
techno-

pre. Used to form words relating to technology

Wikipedia
Techno-