tests: travis.yml: ngx-releng depends on ack. (openresty#1986)

cppcoffee · web-flow · commit 1637b35349be · 2022-01-04T14:10:39.000+08:00
diff --git a/.travis.yml b/.travis.yml
@@ -14,6 +14,7 @@ compiler:
 addons:
   apt:
     packages:
+      - ack
       - axel
       - cpanminus
       - libtest-base-perl
