add new archlinux.org gpg key for juergen

Add a new packager key

Details

• Username: juergen
• PGP key ID: 209A36D43CE2E87DA861FC58539DFD48135182EF

Related issue: #125 (closed)

Checks

• All steps in the accompanying ticket are fulfilled.

Main key holders

• The public key has been validated according to the best practices