[gnome-initial-setup/wjt/ci-refresh-dockerfile: 2/2] ci: Improve usage output from run-docker.sh

[Will Thompson <wjt src gnome org>]

commit cc7d8250d79343f5a42fba80358a74e44abd9ac8
Author: Will Thompson <wjt endlessos org>
Date:   Wed Jan 13 10:30:56 2021 +0000

    ci: Improve usage output from run-docker.sh

 .gitlab-ci/run-docker.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci/run-docker.sh b/.gitlab-ci/run-docker.sh
index 3058f2af..420b1d48 100755
--- a/.gitlab-ci/run-docker.sh
+++ b/.gitlab-ci/run-docker.sh
@@ -70,7 +70,7 @@ fi
 
 # All commands after this require --base to be set
 if [ -z $base ]; then
-        echo "Usage: $0 <command>"
+        echo "Usage: $0 <command> --base=<BASENAME>"
         exit 1
 fi