Add zsh completion for 'docker-compose build --build-arg'
Add zsh completion for 'docker-compose build --build-arg'

Signed-off-by: Steve Durrheimer <a2c1a055e5b399822be341b4e663de3cd05cf8f7@gmail.com>

jrabbit/compose,sdurrheimer/compose,vdemeester/compose,shin-/compose,thaJeztah/compose,swoopla/compose,funkyfuture/docker-compose,schmunk42/compose,dnephin/compose,shin-/compose,funkyfuture/docker-compose,sdurrheimer/compose,vdemeester/compose,thaJeztah/compose,hoogenm/compose,dnephin/compose,hoogenm/compose,schmunk42/compose,swoopla/compose,jrabbit/compose