Add YubiKey SSH key to Coded

Change-Id: I53e33f8c7fa21220e5407d4cd75a705c8e19f9a3
diff --git a/.gitignore b/.gitignore
index 4f58826..7c6dfb9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 secrets/.decrypted~*
+secrets/*.tmp.*
 .direnv/