TBR: physical-lock: Add '/.jiri' to .gitignore in all repos.

Change-Id: I59e9fc568f8df3e0d6dd9539d29814185be204d9
MultiPart: 21/28
PresubmitTest: none
diff --git a/.gitignore b/.gitignore
index d6aced5..6dcf6b1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
+/.jiri
+#TODO(nlacasse): Get rid of .v23 below once v23->jiri transition is complete.
 /.v23
 /go/bin/
 /go/pkg/