Are there any drugs that target the lipid envelope of viruses?
The lipids in the viral envelope come from chunks of the host cell membrane. Therefore, something targeting those lipids is unlikely to be virus-specific, and not suitable for use in a living animal.

Out in the environment where the virus is found in surfaces and such, sure, one can target the lipid envelope using soaps/detergents and such, but you wouldn't want to take those internally.