checks: move ssh_keys to lib/ssh

checks/borgbackup/borg_test

@@ -1,7 +0,0 @@
------BEGIN OPENSSH PRIVATE KEY-----
-b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZW
-QyNTUxOQAAACASG8CFZy8vrqA2erivzgnNUCuOkiBngt5lXPOXai2EMAAAAJAOOON0Djjj
-dAAAAAtzc2gtZWQyNTUxOQAAACASG8CFZy8vrqA2erivzgnNUCuOkiBngt5lXPOXai2EMA
-AAAEDTjUOWSYeU3Xu+Ol1731b9rXeEVXSdrhVOraA+7/35JBIbwIVnLy+uoDZ6uK/OCc1Q
-K46SIGeC3mVc85dqLYQwAAAADGxhc3NAaWduYXZpYQE=
------END OPENSSH PRIVATE KEY-----

checks/borgbackup/borg_test.pub

@@ -1 +0,0 @@
-ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBIbwIVnLy+uoDZ6uK/OCc1QK46SIGeC3mVc85dqLYQw lass@ignavia

checks/borgbackup/default.nix

@@ -9,7 +9,7 @@
         services.openssh.enable = true;
         services.borgbackup.repos.testrepo = {
           authorizedKeys = [
-            (builtins.readFile ./borg_test.pub)
+            (builtins.readFile ../lib/ssh/pubkey)
           ];
         };
       }
@@ -22,7 +22,7 @@
           enable = true;
           destinations.test = {
             repo = "borg@localhost:.";
-            rsh = "ssh -i ${./borg_test} -o StrictHostKeyChecking=no";
+            rsh = "ssh -i ${../lib/ssh/privkey} -o StrictHostKeyChecking=no";
           };
         };
       }