Make gpg ssh support configurable

_machines/ares.yml

@@ -13,6 +13,7 @@ users:
   mail: hannes@hkoerber.de
   git_gpg_sign: false
   gpg_agent: true
+  gpg_agent_for_ssh: true
   gpg_keys:
     master_key: "0xB5C002530C6A2053"
   environment:

_machines/tb-hak.yml

@@ -12,6 +12,7 @@ users:
   mail: hannes.koerber@tradebyte.com
   git_gpg_sign: false
   gpg_agent: false
+  gpg_agent_for_ssh: false
   environment:
     MACHINE_HAS_NEXTCLOUD: "false"
 - name: hannes-private
@@ -20,6 +21,7 @@ users:
   mail: hannes@hkoerber.de
   git_gpg_sign: false
   gpg_agent: true
+  gpg_agent_for_ssh: true
   gpg_keys:
     master_key: "0xB5C002530C6A2053"
   environment: