cluster/services/storage: use locksmith secrets for external storage

cluster/services/storage/default.nix

@@ -95,7 +95,10 @@ in
   };
 
   garage = {
-    keys.storage-prophet = {};
+    keys.storage-prophet.locksmith = {
+      nodes = [ "prophet" ];
+      format = "s3ql";
+    };
     buckets.storage-prophet = {
       allow.storage-prophet = [ "read" "write" ];
     };

cluster/services/storage/external.nix

@@ -8,7 +8,7 @@ in
   services.external-storage = {
     fileSystems.external = {
       mountpoint = "/srv/storage";
-      authFile = ./secrets/external-storage-auth-${hostName}.age;
+      locksmithSecret = "garage-storage-${hostName}";
       backend = "s3c4://${cluster.config.links.garageS3.hostname}/storage-${hostName}";
       backendOptions = [ "disable-expect100" ];
     };

cluster/services/storage/secrets/external-storage-auth-prophet.age

@@ -1,11 +0,0 @@
-age-encryption.org/v1
--> ssh-ed25519 NO562A tC8lfwNJIXjVJImBq25v/NGIQ1Ns24NpCzksbw/eb3w
-2hQltUYSO2Gpjd+49IQR1UJOhy33xWvNH6dx+uGDvFA
--> ssh-ed25519 5/zT0w dapxQ/VV0peQKMwghQJ91wQVahYOqxw2QrXqQCau82c
-0DnIF5ISoB5htYA3X5DSTgLJXLSkqjz1O0CMcmnnrjQ
--> ssh-ed25519 YIaSKQ ehv+WWCLC/co9lhpa+cAdqJUG33L/Vkn6lUXOwNRV2w
-LEobbvvpq6lPNbzasGeXf9NabN150ZVe5n5OJNgbyD4
---- FrT2CFmuWQ+vKGbBY2pGT90Mu8WzXfpbIAzYdR3Vb2w
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