[xen master] CI: Add gnu grep to alpine containers

[patchbot@xxxxxxx]

commit 47052d8cca272efe262d58cb9f861e71be1e6fc2
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Tue Feb 15 20:49:10 2022 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Fri Feb 18 17:07:53 2022 +0000

    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@xxxxxxxxxx>
    Reviewed-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
 automation/build/alpine/3.12.dockerfile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/automation/build/alpine/3.12.dockerfile 
b/automation/build/alpine/3.12.dockerfile
index 4ee3ddc12e..4cce7ab926 100644
--- 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 && \
--
generated by git-patchbot for /home/xen/git/xen.git#master