feat(grfn/system): Set up a buildkite agent on ogopogo

Change-Id: Ica7729d4f08b5345dfd50c22cae388d8bc014a3c
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10662
Autosubmit: aspen <root@gws.fyi>
Reviewed-by: aspen <root@gws.fyi>
Tested-by: BuildkiteCI

users/grfn/secrets/cloudflare.age

@@ -1,9 +1,9 @@
 age-encryption.org/v1
--> ssh-ed25519 CpJBgQ tWx7wXCFjOOfD0wKRHHvLUdR+SF0i43xvnQG9GKurnk
-NRh7kSn7wqw80Y9EFr9Ccft+zYMadXZhYNPEaQlQXtQ
--> ssh-ed25519 LfBFbQ SPQMLC3Ehw00IG1CcbcLFZI2tHy89fjRgVgH4Iw2iBM
-oo2gT9472/DFRoZ6TYxhnM9ylRUNzoS8mLQYvn+4OSM
--> D[7+*-grease `>j ~Jk Dz%o vaKET3
-TkKVm8IpqfiVzETAi9+zuUtCdkReB+lHtthwNw
---- 3iOmY4TNICMi/Fz7k8pmoZlFym9uQBWNtHNlizoAMaM
-ZPzQ6ÊäžÂ5¾½¼ATÀ¸I¯·©;¾;Зy5]­œkÿ^!¶`¬ƒt™—$ÿR’Ö‚<C396>tÞëK)ò<><Ýã§k¾ûû_°#XmASŠpU1©üŽ@šÂ)ûâc©ÖºÝqœÿj1zÑ,HÄÂÞgÈß:è‘
+-> ssh-ed25519 CpJBgQ AVkUs8tuzVlDq3FH/zRrBr5f4KR05fONM6iCluq6hyM
+feS2cxFowSWfDdUQjtmIiMc5338n805yownSZ/ZWfS8
+-> ssh-ed25519 LfBFbQ F67irB+DYQ8WMhaFcO+3o0O0lJsf+tWFZ9cSGSuHgA8
+EKS4zRGUEgeldjxdx4sIsnorWHoeTlXa9LJtNf9lkAM
+-> QvY:XSvC-grease 04
+pBnXsOF6qugcSBp+pw
+--- +g65NbIxu6bVVerS93kYZpEO5ssUZfCD+sZMzOjDUdU
+RîTÀmaF[BʺøÕ0ƒa_&Ë•<C38B>=3dlzRVi´6-9<>á:þü³¿U.EÈà…	üª —JΙŒß÷ÆÛA·-€qྟ÷·Ð|¡™Ð}}a=žHº+]m™<6D>tÀ<74><C380>¯Rø–à%9\˜õJt€š|1B¿

users/grfn/secrets/secrets.nix

@@ -1,6 +1,7 @@
 let
   grfn = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIMcBGBoWd5pPIIQQP52rcFOQN3wAY0J/+K2fuU6SffjA";
   mugwump = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFE2fxPgWO+zeQoLBTgsgxP7Vg7QNHlrQ+Rb3fHFTomB";
+  ogopogo = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINoS7PqM8d7xc8nn0yfiPGfRaH8U/nq2Jm27nRO3L5P0";
   bbbg = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIL/VzrNEY47KPTce3dgfORkAbweWkr4BI8j54BAIs7bG";
 in
 
@@ -8,6 +9,6 @@ in
   "bbbg.age".publicKeys = [ grfn mugwump bbbg ];
   "cloudflare.age".publicKeys = [ grfn mugwump ];
   "ddclient-password.age".publicKeys = [ grfn mugwump ];
-  "buildkite-ssh-key.age".publicKeys = [ grfn mugwump ];
-  "buildkite-token.age".publicKeys = [ grfn mugwump ];
+  "buildkite-ssh-key.age".publicKeys = [ grfn mugwump ogopogo ];
+  "buildkite-token.age".publicKeys = [ grfn mugwump ogopogo ];
 }