CI: Add gnu grep to alpine containers

A forthcoming change is going to want more support than busybox's grep can
provide.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>

diff --git a/automation/build/alpine/3.12.dockerfile b/automation/build/alpine/3.12.dockerfile
index 4ee3ddc12e5262eda51549291f7dbca40cfb596d..4cce7ab926dcadfef0e3141e4e31df12105cc4ca 100644 (file)
--- a/automation/build/alpine/3.12.dockerfile
+++ b/automation/build/alpine/3.12.dockerfile
@@ -26,6 +26,7 @@ RUN \
   # gettext for Xen < 4.13
   apk add gettext && \
   apk add git && \
+  apk add grep && \
   apk add iasl && \
   apk add libaio-dev && \
   apk add linux-headers && \