Fix prevent trailing whitespace lint command

Recently we added a jpg file to OSH documentation
but the lint job didn't run due to the job configuration.

But then for the next PR link job did run and failed
due to trailing whitespace in the jpg file.

Change-Id: I9abf8f93a4566411076190965f282375846dc5db

playbooks/lint.yml

@@ -38,7 +38,7 @@
       when: lint_osh is defined
 
     - name: Prevent trailing whitespaces
-      shell: find . \! \( -path "*/\.*" -o -path "*/doc/build/*" -o -name "*.tgz" -o -name "*.png" \) -type f -exec egrep -l " +$" {} \;
+      shell: find . \! \( -path "*/\.*" -o -path "*/doc/build/*" -o -name "*.tgz" -o -name "*.png" -o -name "*.jpg" \) -type f -exec grep -El " +$" {} \;
       register: _found_whitespaces
       failed_when: _found_whitespaces.stdout != ""
       args:

zuul.d/jobs.yaml

@@ -22,7 +22,6 @@
       - openstack/openstack-helm-infra
     irrelevant-files:
       - ^.*\.rst$
-      - ^doc/.*$
       - ^releasenotes/.*$
 
 - job: