add environment-var expanding for exclude-files
add environment-var expanding for exclude-files

ckemper67/restic,middelink/restic,fawick/restic,ar-jan/restic,kurin/restic,middelink/restic,byo/restic,restic/restic,jayme-github/restic,byo/restic,mappu/restic,arithmetric/restic,fawick/restic,ar-jan/restic,jayme-github/restic,restic/restic,kurin/restic,stuertz/restic,stuertz/restic