Adding empty vendor folder for docker-build

Change-Id: I94266965d78773d7d902e9bd241333d2f1eaa9ba
diff --git a/.gitignore b/.gitignore
index dbc2a92..d0d8872 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,3 @@
-vendor
 
 /bbsim
 /bbsimctl
diff --git a/vendor/.gitignore b/vendor/.gitignore
new file mode 100644
index 0000000..d6b7ef3
--- /dev/null
+++ b/vendor/.gitignore
@@ -0,0 +1,2 @@
+*
+!.gitignore