ci: use dump_packages.py callback to get packages used by role

This adds the dump_packages.py callback which will dump the
arguments to the `package` module (except for `state: absent`)
to the integration test run logs.  The output looks like this:
`lsrpackages: pkg-a pkg-b ...`
We will have tooling which will scrape the logs to extract the
packages used at runtime and testing for all of the supported
combinations of distribution and version.

This also ensures the weekly-ci PR git commit message conforms
to commitlint.

Signed-off-by: Rich Megginson <[email protected]>

.github/dependabot.yml

@@ -4,6 +4,6 @@ updates:
   - package-ecosystem: github-actions
     directory: /
     schedule:
-      interval: weekly
+      interval: monthly
     commit-message:
       prefix: ci