fix: make gpg configuration to work
install also `gpg-agent` as it's needed by gpg to import keys.
closes #48
Signed-off-by: 
Sylvain Desbureaux <sylvain.desbureaux@orange.com>
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install also `gpg-agent` as it's needed by gpg to import keys.
closes #48
Signed-off-by: Sylvain Desbureaux <sylvain.desbureaux@orange.com>