env: add openbsd-386

Fixes golang/go#8642

Change-Id: Ie27c627aa7c4bcff72449dee080865bd148c65e7
Reviewed-on: https://go-review.googlesource.com/3198
Reviewed-by: Andrew Gerrand <adg@golang.org>
diff --git a/env/openbsd-386/.gitignore b/env/openbsd-386/.gitignore
new file mode 100644
index 0000000..c05bc10
--- /dev/null
+++ b/env/openbsd-386/.gitignore
@@ -0,0 +1,9 @@
+boot.conf
+disk.raw
+etc
+install.site
+install56-patched.iso
+install56.iso
+random.seed
+site56.tgz
+openbsd-386-gce.tar.gz