Add a shared git hooks directory

This PR adds a place to share git hooks.

dev/README.md

@@ -4,6 +4,8 @@ Nomad itself.
 See the individual packages for more detail on how to use the configuration
 files. At a high-level the use case for each package is as follows:
 
+* `hooks`: This package provides helpful git hooks for developing Nomad.
+
 * `docker-clients`: This package provides a Nomad job file that can be used to
   spin up Nomad clients in Docker containers. This provides a simple mechanism
   to create a Nomad cluster locally.

dev/hooks/pre-push

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+if [ "$remote" == "enterprise" ]; then
+    exit 0
+fi
+
+if [ -f version/version_ent.go ]; then
+    echo "Found enterprise version file while pushing to oss remote"
+    exit 1
+fi
+
+exit 0