Add OpenPGP key to LDAP directory and User model

Gemfile.lock

@@ -197,6 +197,8 @@ GEM
       raabro (~> 1.4)
     globalid (1.2.1)
       activesupport (>= 6.1)
+    gpgme (2.0.24)
+      mini_portile2 (~> 2.7)
     hashdiff (1.1.0)
     i18n (1.14.1)
       concurrent-ruby (~> 1.0)
@@ -483,6 +485,7 @@ GEM
     xpath (3.2.0)
       nokogiri (~> 1.8)
     yard (0.9.34)
+    zbase32 (0.1.1)
     zeitwerk (2.6.12)
 
 PLATFORMS
@@ -507,6 +510,7 @@ DEPENDENCIES
   flipper
   flipper-active_record
   flipper-ui
+  gpgme (~> 2.0.24)
   image_processing (~> 1.12.2)
   importmap-rails
   jbuilder (~> 2.7)
@@ -540,6 +544,7 @@ DEPENDENCIES
   warden
   web-console (~> 4.2)
   webmock
+  zbase32 (~> 0.1.1)
 
 BUNDLED WITH
    2.5.5