gitlab/gitlab-unicorn-startup: Make sure pg_trgm extension is enabled for gitlab db

Starting from GitLab 8.6 pg_trgm extension becomes hard dependency of
gitlab.

    https://gitlab.com/gitlab-org/gitlab-ce/commit/d24ee2a2

The extension can be activated only by db superuser, so gitlab db
migration scripts does not activate it - it has to be done by DB
administrator or is handled by integrating code in omnibus case.

As we already handle DB setup and migrations in unicorn startup script,
as pre-action there, let's activate pg_trgm.

software/gitlab/gitlab-unicorn-startup.in

@@ -35,6 +35,9 @@ while true; do
 done
 echo "I: PostgreSQL ready." 1>&2
 
+# make sure pg_trgm extension is enabled for gitlab db
+psql -c 'CREATE EXTENSION IF NOT EXISTS pg_trgm;'   || die "pg_trgm setup failed"
+
 if echo "$pgtables" | grep -q '^No relations found' ; then
     $RAKE db:schema:load db:seed_fu  || die "initial db setup failed"
 fi

software/gitlab/software.cfg

@@ -243,7 +243,7 @@ md5sum  = cdcb2036c33da547a2cf5d0515cf48ff
 
 [gitlab-unicorn-startup.in]
 <= download-file
-md5sum  = e68d1b5376e79c5e606dce050c633d27
+md5sum  = a9cb347f60aad3465932fd36cd4fe25d
 
 [gitlab.yml.in]
 <= download-template