Use proper identify file for tethys

ssh/.ssh/config

@@ -43,6 +43,10 @@ Host *.internal.elationemr.com
   User colinpowell
   IdentityFile ~/.ssh/elation
 
+Host tethys.local
+  User colinpowell
+  IdentityFile ~/.ssh/powellc
+
 Host 10.201.*
   User colinpowell
   IdentityFile ~/.ssh/id_ed25519