[PATCH] tests/docker: Use lower case for centos8 powertools

[Jiaxun Yang]

Our gitlab amd64-centos8-container pipeline constantly fail at:

15.36 Error: No matching repo to modify: PowerTools.

Fix it by convert it to lower case.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
---
 tests/docker/dockerfiles/centos8.docker | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/docker/dockerfiles/centos8.docker 
b/tests/docker/dockerfiles/centos8.docker
index 54bc6d54cd..06b67962fd 100644
--- a/tests/docker/dockerfiles/centos8.docker
+++ b/tests/docker/dockerfiles/centos8.docker
@@ -31,6 +31,6 @@ ENV PACKAGES \
     zlib-devel
 
 RUN dnf install -y dnf-plugins-core && \
-  dnf config-manager --set-enabled PowerTools && \
+  dnf config-manager --set-enabled powertools && \
   dnf install -y $PACKAGES
 RUN rpm -q $PACKAGES | sort > /packages.txt
-- 
2.29.2