Bump OnEarth release to 2.8.6-2

Author: jtroberts

version.sh

@@ -4,4 +4,4 @@
 export ONEARTH_VERSION=2.8.6 # This must be manually incremented with each OnEarth version
 
 # The onearth release to use in the Docker image tag (e.g. onearth-wms:{ONEARTH_VERSION}-{ONEARTH_RELEASE}).
-export ONEARTH_RELEASE=1 # This must be manually incremented with each OnEarth build
+export ONEARTH_RELEASE=2 # This must be manually incremented with each OnEarth build