Make it possible to set custom permissions for certificate files

This is in preparation for a role using OpenSMTPD.

playbooks/roles/cert/meta/argument_specs.yaml

@@ -30,3 +30,23 @@ argument_specs:
         description: The zone to use for publishing the TXT record.
         required: true
         type: str
+      cert__fullchain_pem_permissions:
+        description: Permissons for the `fullchain.pem`.
+        type: str
+        required: false
+        default: "0660"
+      cert__chain_pem_permissions:
+        description: Permissons for the `chain.pem`.
+        type: str
+        required: false
+        default: "0660"
+      cert__cert_pem_permissions:
+        description: Permissons for the `cert.pem`.
+        type: str
+        required: false
+        default: "0660"
+      cert__privkey_pem_permissions:
+        description: Permissons for the `privkey.pem`.
+        type: str
+        required: false
+        default: "0600"