gitlab-ci: Append /usr/bin/*_perl to PATH

Under archlinux-based container runs, non-login shells need to source
/etc/profile to have package-specific commands such as encguess (under
/usr/bin/core_perl) appended in its PATH.

Add the command so that the change in commit 00361e8bb1e5 ("Convert
*.log files into UTF-8 encoding") to work in gitlab-ci builds.

Signed-off-by: Akira Yokosawa <akiyks@gmail.com>
Cc: Leonardo Bras <lsoaresp@redhat.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

utilities/gitlab-ci.yml

diff --git a/utilities/gitlab-ci.yml b/utilities/gitlab-ci.yml
index 60e70a2..f03e39a 100644
--- a/utilities/gitlab-ci.yml
+++ b/utilities/gitlab-ci.yml
@@ -23,6 +23,7 @@
         - mkdir -p ~/.local/share/fonts && cp fonts/steel-city-comic.regular.ttf ~/.local/share/fonts/ && fc-cache
 
     script:
+        - source /etc/profile
         - make perfbook.pdf perfbook-1c.pdf perfbook-eb.pdf
 
     artifacts: