fix(ssh): pin Gitea host keys

configs/nixos/modules/network/ssh.nix

@@ -33,10 +33,14 @@ let
   });
 
   extraTargets = {
-    # TODO: Pin Gitea's host key after deploying its Pikachu guest.
     gitea = {
       hostName = "git.alexion.dev";
       user = "gitea";
+      hostKeys = [
+        "ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBFcUl17AcZz1wS8ek2yS/bu5NRTX4ViYTuFOSnp8leHmirP3Zk5QlC33hodQp09J6EA6Vl8zUowy4qLud7BMurQ="
+        "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICkK2W2Ev+9RXa2PNXiNPPCPF5ln2+M2jHiGoZ4cPYxX"
+        "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAACAQDZSeU1iRHoaIXgbYe0kAiOAASw9LrQhu54RNCoTQ2O1rbqgnnKO2qbYJvfmUWL7jqEkEotgUBy4Xqxgfl7rXGQ9viWZe+i2tKwJdGsabNLJ+QTDCNyGCd22s1Hhl7n68JvuLTENXl4WpH56MB3yjFmK9onLHHcLG+rWiR0I6Yn264LfNVX0RuZK7TlG0tUKJR5bQBXGT6PxAE1IceYRgbgM0BYq4nakNg/s4ZSpmJFrrGfCHNsnHiEmFAXRFrGwf+0ef2STDukM/ADLziPXu0Ge7k72/UPvtEdcpgvzIDMJ2EznKTnxIoZnFkrDqhGOo8DnXK+cFVKAkkC6NgWQpO6fNnY+MEDgSb0fr/rGcwzUa1p+fON5/zEYxsAtKyAeP4D7OEAo65lsSKqi1tbt521miTobp0NOT8p4tGgHTwmshbqlmUZz0DVexN6uc7yzoHu4V/oYomEWP/j/E2uuvLi57AaJbM3Z/oAHUtrHFK9A9FFggyzpETZE7qWA9BhO/pJQUsjdWRm0pUHsPlf9Uqqit2BKVERiMSlHsBKch4tIk4ryZBazWunDD+QFcllKG74nMVISZ7i8q9IfNy+PWQuJIEm5XrT9W5pnkBIWrePlcAcPo080ALigmyhH+WOPiyO+dfueeq6PVdu2Voc+6FvtylRcn4u8O+E5Wq5amvQAQ=="
+      ];
       aliases = [
         "gitea"
         "git.alexion.dev"