ci: skip most CI checks if title contains citest skip [citest_skip]

When we submit a PR for a CI update or docs, we do not want to start CI checking
for ansible-lint, qemu, etc.  When we are doing CI updates to 30 or more
roles, this fires off a lot of unnecessary tests, which sometimes causes the
linux-system-roles org in github to be throttled.

When submitting a PR that can skip ci, use "[citest_skip]" in the PR title.

Signed-off-by: Rich Megginson <rmeggins@redhat.com>

.github/workflows/test_converting_readme.yml

@@ -15,6 +15,9 @@ permissions:
   contents: read
 jobs:
   test_converting_readme:
+    if: |
+      !((github.event_name == 'pull_request' && contains(github.event.pull_request.title, '[citest_skip]')) ||
+        (github.event_name == 'push' && contains(github.event.head_commit.message, '[citest_skip]')))
     runs-on: ubuntu-latest
     permissions:
       contents: write